- published: 21 Aug 2013
- views: 132071
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A basic guide to visual acuity
Constructive feedback is always appreciated
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) **
This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. For more great clinical education materials, go to sharcfm.ca, the Shared Canadian Curriculum in Family Medicine!
- published: 23 Mar 2015
- views: 53168
Healthy Eyes, Doctor Delivered.
This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctorsofoptometry.com.
To ask a doctor, visit our Facebook page at www.facebook.com/AskaDoctorofOptometry
Featured Expert: Dr. Paul Neumann, OD
- published: 14 Mar 2011
- views: 5908
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
- published: 05 May 2011
- views: 31226
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk
For more on this research, visit: http://www.rochester.edu/newscenter/how-understanding-gps-can-help-you-hit-a-curveball
Note: it may help to view this video full screen on a larger monitor, or to view the screen from closer than normal to get the full effect of the illusions.
Researchers at the University of Rochester's Center for Visual Science used some well-known illusions to test a hypothesis. What they found was that when objects in motion are seen in the peripheral vision, where the information is less clear, the human brain works a lot like a global positioning that is struggling with a weak signal.
When your phone's GPS has a strong signal, it's very good at locating where you are and where you're going, but when the signal is weak, it needs to use an algorithm, known as the Kalman Filter, to estimate your direction and position. With the weaker visual signal in the peripheral vision, the brain also uses the same algorithm to estimate where moving objects are, and in both cases, the results aren't always perfect.
These animations illustrate the concepts that the researchers were looking at, such as the "curveball illusion". This deals with the sudden, sharp break that batters perceive when a curveball is quickly approaching the plate and enters their peripheral vision. The actual motion of that pitch is a much more steady, gradual curve, but it's this imperfect processing of the information that happens in the brain that causes the illusion.
This research was conducted by Duje Tadin, associate professor of brain and cognitive sciences at the University of Rochester, as well as Oh-Sang Kwon, assistant professor at the Ulsan National Institute of Science and Technology, South Korea. The senior researcher was David C. Knill, professor of brain and cognitive sciences and associate director of the Center for Visual Science at the University of Rochester.
Help us caption & translate this video!
http://amara.org/v/Gj6I/
- published: 22 Jun 2015
- views: 45373
Optimal Vision Eyewear at http://www.visio-rx.com
The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visual acuity is determined. Visual acuity refers to the clearness of your vision. This number is determined sometime during a routine eye exam, by use of a Snellen chart (one with rows of different letters of varying sizes) or a "tumbling E chart" (with E's facing in various directions and sizes).
While we commonly think of 20/20 as 'perfect vision'. you can have better than perfect vision. View this video to find out how.
Eyewear Which Makes You see - at http://www.visio-rx.com
You will not be disappointed!
You hear the term all the time, but what does 20/20 vision actually mean?
20/20 means that you can see at 20 feet away what a person with normal sight can see at 20 feet. The number is an indication of your visual acuity.
If you can only see the top E, that means you can see at 20 feet what a person with normal sight can see at 200 feet. This is called 20/200 vision.
If you can read this row, you have 20/40 vision: Normal sight sees at 40 feet what you see at 20 feet.
When you are able to read this row (called 20/10 vision), it means that you can see at 20 feet what normal sight can see at 10 feet. This means you have exceptional sight.
The first number refers to the 20 feet you are away from the chart. Even if the chart isn't 20 feet from you, the chart is scaled to look like it's 20 feet away through the use of projectors and mirrors.
This number always refers to "normal sight". The bigger the letters, the bigger the number. The smaller the letters you can read on the chart from 20 feet away, the better your visual acuity is.
Your visual acuity is usually measured with and without corrective measures, to verify that the prescription is sufficient.
#F22
- published: 07 Oct 2011
- views: 68123
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/
This video aims to give you an idea of what's required in the Eye Examination / Visual Assessment OSCE.
Like us on FACEBOOK http://www.facebook.com/geekymedics
Follow us on TWITTER at http://www.twitter.com/geekymedics
Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video.
- published: 12 Sep 2013
- views: 191658
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php
Visual Acuity (EDTRS -- measurement of visual acuity).
The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts.
This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps.
As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern.
On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value.
The method is highly standardized and has been adopted generally for vision research.
- published: 15 Sep 2011
- views: 11012
Visual acuity
Visual acuity (VA) commonly refers to the clarity of vision. Visual Acuity is dependent on optical and neural factors, i.e., (i) the sharpness of the retinal focus within the eye, (ii) the health and functioning of the retina, and (iii) the sensitivity of the interpretative faculty of the brain.
A common cause of low visual acuity is refractive error (ametropia), or errors in how the light is refracted in the eyeball. Causes of refractive errors include aberrations in the shape of the eyeball, the shape of the cornea, and reduced flexibility of the lens. In the case of pseudomyopia, the aberrations are caused by muscle spasms. Too high or too low refractive error (in relation to the length of the eyeball) is the cause of nearsightedness (myopia) or farsightedness (hyperopia) (normal refractive status is referred to as emmetropia). Other optical causes are astigmatism or more complex corneal irregularities. These anomalies can mostly be corrected by optical means (such as eyeglasses, contact lenses, laser surgery, etc.).
This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Visual_acuity
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
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4:58Visual Acuity in 5 min
Visual Acuity in 5 minVisual Acuity in 5 min
A basic guide to visual acuity Constructive feedback is always appreciated -
12:25How to Check Visual Acuity
How to Check Visual AcuityHow to Check Visual Acuity
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) ** This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. For more great clinical education materials, go to sharcfm.ca, the Shared Canadian Curriculum in Family Medicine! -
1:29What is visual acuity?
What is visual acuity?What is visual acuity?
Healthy Eyes, Doctor Delivered. This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctorsofoptometry.com. To ask a doctor, visit our Facebook page at www.facebook.com/AskaDoctorofOptometry Featured Expert: Dr. Paul Neumann, OD -
10:17Ophthalmic Skills Video - Testing Visual Acuity
Ophthalmic Skills Video - Testing Visual Acuity -
2:53Part 2: Visual Acuity Exam
Part 2: Visual Acuity ExamPart 2: Visual Acuity Exam
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam. -
2:17Testing Your Visual Acuity
Testing Your Visual AcuityTesting Your Visual Acuity
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk For more on this research, visit: http://www.rochester.edu/newscenter/how-understanding-gps-can-help-you-hit-a-curveball Note: it may help to view this video full screen on a larger monitor, or to view the screen from closer than normal to get the full effect of the illusions. Researchers at the University of Rochester's Center for Visual Science used some well-known illusions to test a hypothesis. What they found was that when objects in motion are seen in the peripheral vision, where the information is less clear, the human brain works a lot like a global positioning that is struggling with a weak signal. When your phone's GPS has a strong signal, it's very good at locating where you are and where you're going, but when the signal is weak, it needs to use an algorithm, known as the Kalman Filter, to estimate your direction and position. With the weaker visual signal in the peripheral vision, the brain also uses the same algorithm to estimate where moving objects are, and in both cases, the results aren't always perfect. These animations illustrate the concepts that the researchers were looking at, such as the "curveball illusion". This deals with the sudden, sharp break that batters perceive when a curveball is quickly approaching the plate and enters their peripheral vision. The actual motion of that pitch is a much more steady, gradual curve, but it's this imperfect processing of the information that happens in the brain that causes the illusion. This research was conducted by Duje Tadin, associate professor of brain and cognitive sciences at the University of Rochester, as well as Oh-Sang Kwon, assistant professor at the Ulsan National Institute of Science and Technology, South Korea. The senior researcher was David C. Knill, professor of brain and cognitive sciences and associate director of the Center for Visual Science at the University of Rochester. Help us caption & translate this video! http://amara.org/v/Gj6I/ -
1:23What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
Optimal Vision Eyewear at http://www.visio-rx.com The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visual acuity is determined. Visual acuity refers to the clearness of your vision. This number is determined sometime during a routine eye exam, by use of a Snellen chart (one with rows of different letters of varying sizes) or a "tumbling E chart" (with E's facing in various directions and sizes). While we commonly think of 20/20 as 'perfect vision'. you can have better than perfect vision. View this video to find out how. Eyewear Which Makes You see - at http://www.visio-rx.com You will not be disappointed! You hear the term all the time, but what does 20/20 vision actually mean? 20/20 means that you can see at 20 feet away what a person with normal sight can see at 20 feet. The number is an indication of your visual acuity. If you can only see the top E, that means you can see at 20 feet what a person with normal sight can see at 200 feet. This is called 20/200 vision. If you can read this row, you have 20/40 vision: Normal sight sees at 40 feet what you see at 20 feet. When you are able to read this row (called 20/10 vision), it means that you can see at 20 feet what normal sight can see at 10 feet. This means you have exceptional sight. The first number refers to the 20 feet you are away from the chart. Even if the chart isn't 20 feet from you, the chart is scaled to look like it's 20 feet away through the use of projectors and mirrors. This number always refers to "normal sight". The bigger the letters, the bigger the number. The smaller the letters you can read on the chart from 20 feet away, the better your visual acuity is. Your visual acuity is usually measured with and without corrective measures, to verify that the prescription is sufficient. #F22 -
1:11Dynamic Visual Acuity Test
Dynamic Visual Acuity TestDynamic Visual Acuity Test
-
5:57Examination of the Eyes and Vision - OSCE Guide
Examination of the Eyes and Vision - OSCE GuideExamination of the Eyes and Vision - OSCE Guide
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/ This video aims to give you an idea of what's required in the Eye Examination / Visual Assessment OSCE. Like us on FACEBOOK http://www.facebook.com/geekymedics Follow us on TWITTER at http://www.twitter.com/geekymedics Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video. -
7:13Visual Acuity
Visual AcuityVisual Acuity
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php Visual Acuity (EDTRS -- measurement of visual acuity). The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts. This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps. As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern. On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value. The method is highly standardized and has been adopted generally for vision research.
-
Visual Acuity in 5 min
A basic guide to visual acuity Constructive feedback is always appreciated
published: 21 Aug 2013 -
How to Check Visual Acuity
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) ** This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. For more great clinical education materials, go to sharcfm.ca, the Shared Canadian Curriculum in Family Medicine!
published: 23 Mar 2015 -
What is visual acuity?
Healthy Eyes, Doctor Delivered. This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctorsofoptometry.com. To ask a doctor, visit our Facebook page at www.facebook.com/AskaDoctorofOptometry Featured Expert: Dr. Paul Neumann, OD
published: 14 Mar 2011 -
-
Part 2: Visual Acuity Exam
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
published: 05 May 2011 -
Testing Your Visual Acuity
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk For more on this research, visit: http://www.rochester.edu/newscenter/how-understanding-gps-can-help-you-hit-a-curveball Note: it may help to view this video full screen on a larger monitor, or to view the screen from closer than normal to get the full effect of the illusions. Researchers at the University of Rochester's Center for Visual Science used some well-known illusions to test a hypothesis. What they found was that when objects in motion are seen in the peripheral vision, where the information is less clear, the human brain works a lot like a global positioning that is struggling with a weak signal. When your phone's GPS has a strong signal, it's ve...
published: 22 Jun 2015 -
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
Optimal Vision Eyewear at http://www.visio-rx.com The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visual acuity is determined. Visual acuity refers to the clearness of your vision. This number is determined sometime during a routine eye exam, by use of a Snellen chart (one with rows of different letters of varying sizes) or a "tumbling E chart" (with E's facing in various directions and sizes). While we commonly think of 20/20 as 'perfect vision'. you can have better than perfect vision. View this video to find out how. Eyewear Which Makes You see - at http://www.visio-rx.com You will not be disappointed! You hear the term all the time, but what does 20/20 vision actually mean? 20/20 means that you can see at 20 feet away wha...
published: 07 Oct 2011 -
Dynamic Visual Acuity Test
published: 05 Apr 2013 -
Examination of the Eyes and Vision - OSCE Guide
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/ This video aims to give you an idea of what's required in the Eye Examination / Visual Assessment OSCE. Like us on FACEBOOK http://www.facebook.com/geekymedics Follow us on TWITTER at http://www.twitter.com/geekymedics Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video.
published: 12 Sep 2013 -
Visual Acuity
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php Visual Acuity (EDTRS -- measurement of visual acuity). The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts. This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps. As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern. On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value. The method is highly standardized and has been adopted genera...
published: 15 Sep 2011
Visual Acuity in 5 min
- Order: Reorder
- Duration: 4:58
- Updated: 21 Aug 2013
- views: 132071
A basic guide to visual acuity
Constructive feedback is always appreciated
A basic guide to visual acuity
Constructive feedback is always appreciated
wn.com/Visual Acuity In 5 Min
A basic guide to visual acuity
Constructive feedback is always appreciated
- published: 21 Aug 2013
- views: 132071
How to Check Visual Acuity
- Order: Reorder
- Duration: 12:25
- Updated: 23 Mar 2015
- views: 53168
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) **
This is a video that teaches how to check patients' distance visu...
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) **
This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. For more great clinical education materials, go to sharcfm.ca, the Shared Canadian Curriculum in Family Medicine!
wn.com/How To Check Visual Acuity
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca) **
This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. For more great clinical education materials, go to sharcfm.ca, the Shared Canadian Curriculum in Family Medicine!
- published: 23 Mar 2015
- views: 53168
What is visual acuity?
- Order: Reorder
- Duration: 1:29
- Updated: 14 Mar 2011
- views: 5908
Healthy Eyes, Doctor Delivered.
This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctors...
Healthy Eyes, Doctor Delivered.
This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctorsofoptometry.com.
To ask a doctor, visit our Facebook page at www.facebook.com/AskaDoctorofOptometry
Featured Expert: Dr. Paul Neumann, OD
wn.com/What Is Visual Acuity
Healthy Eyes, Doctor Delivered.
This video on eye health is brought to you by BC Doctors of Optometry. For more information, please visit us at www.bcdoctorsofoptometry.com.
To ask a doctor, visit our Facebook page at www.facebook.com/AskaDoctorofOptometry
Featured Expert: Dr. Paul Neumann, OD
- published: 14 Mar 2011
- views: 5908
Ophthalmic Skills Video - Testing Visual Acuity
- Order: Reorder
- Duration: 10:17
- Updated: 08 Nov 2014
- views: 4100
Part 2: Visual Acuity Exam
- Order: Reorder
- Duration: 2:53
- Updated: 05 May 2011
- views: 31226
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
wn.com/Part 2 Visual Acuity Exam
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
- published: 05 May 2011
- views: 31226
Testing Your Visual Acuity
- Order: Reorder
- Duration: 2:17
- Updated: 22 Jun 2015
- views: 45373
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk
For more on this research, v...
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk
For more on this research, visit: http://www.rochester.edu/newscenter/how-understanding-gps-can-help-you-hit-a-curveball
Note: it may help to view this video full screen on a larger monitor, or to view the screen from closer than normal to get the full effect of the illusions.
Researchers at the University of Rochester's Center for Visual Science used some well-known illusions to test a hypothesis. What they found was that when objects in motion are seen in the peripheral vision, where the information is less clear, the human brain works a lot like a global positioning that is struggling with a weak signal.
When your phone's GPS has a strong signal, it's very good at locating where you are and where you're going, but when the signal is weak, it needs to use an algorithm, known as the Kalman Filter, to estimate your direction and position. With the weaker visual signal in the peripheral vision, the brain also uses the same algorithm to estimate where moving objects are, and in both cases, the results aren't always perfect.
These animations illustrate the concepts that the researchers were looking at, such as the "curveball illusion". This deals with the sudden, sharp break that batters perceive when a curveball is quickly approaching the plate and enters their peripheral vision. The actual motion of that pitch is a much more steady, gradual curve, but it's this imperfect processing of the information that happens in the brain that causes the illusion.
This research was conducted by Duje Tadin, associate professor of brain and cognitive sciences at the University of Rochester, as well as Oh-Sang Kwon, assistant professor at the Ulsan National Institute of Science and Technology, South Korea. The senior researcher was David C. Knill, professor of brain and cognitive sciences and associate director of the Center for Visual Science at the University of Rochester.
Help us caption & translate this video!
http://amara.org/v/Gj6I/
wn.com/Testing Your Visual Acuity
To view a super slow motion video of the "curveball illusion" in action, please visit: https://www.youtube.com/watch?v=CrWst4DO1tk
For more on this research, visit: http://www.rochester.edu/newscenter/how-understanding-gps-can-help-you-hit-a-curveball
Note: it may help to view this video full screen on a larger monitor, or to view the screen from closer than normal to get the full effect of the illusions.
Researchers at the University of Rochester's Center for Visual Science used some well-known illusions to test a hypothesis. What they found was that when objects in motion are seen in the peripheral vision, where the information is less clear, the human brain works a lot like a global positioning that is struggling with a weak signal.
When your phone's GPS has a strong signal, it's very good at locating where you are and where you're going, but when the signal is weak, it needs to use an algorithm, known as the Kalman Filter, to estimate your direction and position. With the weaker visual signal in the peripheral vision, the brain also uses the same algorithm to estimate where moving objects are, and in both cases, the results aren't always perfect.
These animations illustrate the concepts that the researchers were looking at, such as the "curveball illusion". This deals with the sudden, sharp break that batters perceive when a curveball is quickly approaching the plate and enters their peripheral vision. The actual motion of that pitch is a much more steady, gradual curve, but it's this imperfect processing of the information that happens in the brain that causes the illusion.
This research was conducted by Duje Tadin, associate professor of brain and cognitive sciences at the University of Rochester, as well as Oh-Sang Kwon, assistant professor at the Ulsan National Institute of Science and Technology, South Korea. The senior researcher was David C. Knill, professor of brain and cognitive sciences and associate director of the Center for Visual Science at the University of Rochester.
Help us caption & translate this video!
http://amara.org/v/Gj6I/
- published: 22 Jun 2015
- views: 45373
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
- Order: Reorder
- Duration: 1:23
- Updated: 07 Oct 2011
- views: 68123
Optimal Vision Eyewear at http://www.visio-rx.com
The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visu...
Optimal Vision Eyewear at http://www.visio-rx.com
The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visual acuity is determined. Visual acuity refers to the clearness of your vision. This number is determined sometime during a routine eye exam, by use of a Snellen chart (one with rows of different letters of varying sizes) or a "tumbling E chart" (with E's facing in various directions and sizes).
While we commonly think of 20/20 as 'perfect vision'. you can have better than perfect vision. View this video to find out how.
Eyewear Which Makes You see - at http://www.visio-rx.com
You will not be disappointed!
You hear the term all the time, but what does 20/20 vision actually mean?
20/20 means that you can see at 20 feet away what a person with normal sight can see at 20 feet. The number is an indication of your visual acuity.
If you can only see the top E, that means you can see at 20 feet what a person with normal sight can see at 200 feet. This is called 20/200 vision.
If you can read this row, you have 20/40 vision: Normal sight sees at 40 feet what you see at 20 feet.
When you are able to read this row (called 20/10 vision), it means that you can see at 20 feet what normal sight can see at 10 feet. This means you have exceptional sight.
The first number refers to the 20 feet you are away from the chart. Even if the chart isn't 20 feet from you, the chart is scaled to look like it's 20 feet away through the use of projectors and mirrors.
This number always refers to "normal sight". The bigger the letters, the bigger the number. The smaller the letters you can read on the chart from 20 feet away, the better your visual acuity is.
Your visual acuity is usually measured with and without corrective measures, to verify that the prescription is sufficient.
#F22
wn.com/What Does 20 20 Vision Mean Optimal Vision With Your Spectacles Glasses.
Optimal Vision Eyewear at http://www.visio-rx.com
The term is used all the time, but what exactly does it mean? 20/20 vision is a term relating to the way visual acuity is determined. Visual acuity refers to the clearness of your vision. This number is determined sometime during a routine eye exam, by use of a Snellen chart (one with rows of different letters of varying sizes) or a "tumbling E chart" (with E's facing in various directions and sizes).
While we commonly think of 20/20 as 'perfect vision'. you can have better than perfect vision. View this video to find out how.
Eyewear Which Makes You see - at http://www.visio-rx.com
You will not be disappointed!
You hear the term all the time, but what does 20/20 vision actually mean?
20/20 means that you can see at 20 feet away what a person with normal sight can see at 20 feet. The number is an indication of your visual acuity.
If you can only see the top E, that means you can see at 20 feet what a person with normal sight can see at 200 feet. This is called 20/200 vision.
If you can read this row, you have 20/40 vision: Normal sight sees at 40 feet what you see at 20 feet.
When you are able to read this row (called 20/10 vision), it means that you can see at 20 feet what normal sight can see at 10 feet. This means you have exceptional sight.
The first number refers to the 20 feet you are away from the chart. Even if the chart isn't 20 feet from you, the chart is scaled to look like it's 20 feet away through the use of projectors and mirrors.
This number always refers to "normal sight". The bigger the letters, the bigger the number. The smaller the letters you can read on the chart from 20 feet away, the better your visual acuity is.
Your visual acuity is usually measured with and without corrective measures, to verify that the prescription is sufficient.
#F22
- published: 07 Oct 2011
- views: 68123
Dynamic Visual Acuity Test
- Order: Reorder
- Duration: 1:11
- Updated: 05 Apr 2013
- views: 10368
- published: 05 Apr 2013
- views: 10368
Examination of the Eyes and Vision - OSCE Guide
- Order: Reorder
- Duration: 5:57
- Updated: 12 Sep 2013
- views: 191658
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/
This video aims to give you...
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/
This video aims to give you an idea of what's required in the Eye Examination / Visual Assessment OSCE.
Like us on FACEBOOK http://www.facebook.com/geekymedics
Follow us on TWITTER at http://www.twitter.com/geekymedics
Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video.
wn.com/Examination Of The Eyes And Vision Osce Guide
To see the written guide alongside the video head over to our website http://geekymedics.com/2013/08/28/eye-examination-osce-guide/
This video aims to give you an idea of what's required in the Eye Examination / Visual Assessment OSCE.
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Always adhere to your medical schools / local hospital trusts guidelines when performing examinations or clinical procedures. Do NOT perform any examination or procedure on patients based purely upon the content of these videos. Geeky Medics accepts no liability for loss of any kind incurred as a result of reliance upon information provided in this video.
- published: 12 Sep 2013
- views: 191658
Visual Acuity
- Order: Reorder
- Duration: 7:13
- Updated: 15 Sep 2011
- views: 11012
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php
Visual Acuity (EDTRS -- measurement of visual acui...
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php
Visual Acuity (EDTRS -- measurement of visual acuity).
The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts.
This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps.
As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern.
On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value.
The method is highly standardized and has been adopted generally for vision research.
wn.com/Visual Acuity
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-reports-dews-report.php
Visual Acuity (EDTRS -- measurement of visual acuity).
The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts.
This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps.
As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern.
On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value.
The method is highly standardized and has been adopted generally for vision research.
- published: 15 Sep 2011
- views: 11012
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4:58
Visual Acuity in 5 min
A basic guide to visual acuity
Constructive feedback is always appreciated
published: 21 Aug 2013
Visual Acuity in 5 min
Visual Acuity in 5 min
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- published: 21 Aug 2013
- views: 132071
12:25
How to Check Visual Acuity
** Peer Reviewed (through the Shared Canadian Curriculum in Family Medicine / sharcfm.ca)...
published: 23 Mar 2015
How to Check Visual Acuity
How to Check Visual Acuity
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- published: 23 Mar 2015
- views: 53168
1:29
What is visual acuity?
Healthy Eyes, Doctor Delivered.
This video on eye health is brought to you by BC Doctor...
published: 14 Mar 2011
What is visual acuity?
What is visual acuity?
- Report rights infringement
- published: 14 Mar 2011
- views: 5908
10:17
Ophthalmic Skills Video - Testing Visual Acuity
Produced by Dr. Mustafa Kapasi and Dr. Andre Ali-Ridha
Copyright 2014
published: 08 Nov 2014
Ophthalmic Skills Video - Testing Visual Acuity
Ophthalmic Skills Video - Testing Visual Acuity
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- published: 08 Nov 2014
- views: 4100
2:53
Part 2: Visual Acuity Exam
Part 2 of the Emergency Medicine Eye Exam module: how to perform the visual acuity exam.
published: 05 May 2011
Part 2: Visual Acuity Exam
Part 2: Visual Acuity Exam
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- published: 05 May 2011
- views: 31226
2:17
Testing Your Visual Acuity
To view a super slow motion video of the "curveball illusion" in action, please visit: htt...
published: 22 Jun 2015
Testing Your Visual Acuity
Testing Your Visual Acuity
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- published: 22 Jun 2015
- views: 45373
1:23
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
Optimal Vision Eyewear at http://www.visio-rx.com
The term is used all the time, but what...
published: 07 Oct 2011
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
What does "20/20 Vision" mean? Optimal Vision With your Spectacles Glasses.
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- published: 07 Oct 2011
- views: 68123
1:11
Dynamic Visual Acuity Test
published: 05 Apr 2013
Dynamic Visual Acuity Test
Dynamic Visual Acuity Test
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- published: 05 Apr 2013
- views: 10368
5:57
Examination of the Eyes and Vision - OSCE Guide
To see the written guide alongside the video head over to our website http://geekymedics.c...
published: 12 Sep 2013
Examination of the Eyes and Vision - OSCE Guide
Examination of the Eyes and Vision - OSCE Guide
- Report rights infringement
- published: 12 Sep 2013
- views: 191658
7:13
Visual Acuity
Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-repo...
published: 15 Sep 2011
Visual Acuity
Visual Acuity
- Report rights infringement
- published: 15 Sep 2011
- views: 11012
Visual Acuity in 5 min...
How to Check Visual Acuity...
What is visual acuity?...
Ophthalmic Skills Video - Testing Visual Acuity...
Part 2: Visual Acuity Exam...
Testing Your Visual Acuity...
What does "20/20 Vision" mean? Optimal Vision With...
Dynamic Visual Acuity Test...
Examination of the Eyes and Vision - OSCE Guide...
Visual Acuity...
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Edit The Times of India 09 Oct 2016
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Edit The Hindu 09 Oct 2016
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Witty repartee, clever ending leven 'Then There Were None'
Edit Worcester Telegram 08 Oct 2016
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Edit Topix 08 Oct 2016
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Edit Public Technologies 08 Oct 2016
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Edit Houston Chronicle 08 Oct 2016
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Edit Business Insider 08 Oct 2016
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