Eye

Eyes are the organs of vision. They detect light and convert it into electro-chemical impulses in neurons. In higher organisms, the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods.

The simplest "eyes", such as those in microorganisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment and to the pretectal area to control the pupillary light reflex.

Dark Circles

Dark Circles is a 2013 horror film starring Johnathon Schaech and Pell James.

Synopsis

Alex (Johnathon Schaech) and Penny (Pell James) have decided to uproot themselves from their hectic city lives and move out to the country, believing that it will be better for their baby. The move is not without hesitation, as Penny is concerned that she will not be a fit mother for her baby while Alex can't help but wonder if it would have been better to remain in the city with his bandmates. Soon after they move, strange things begin to occur that cause them to wonder if the move was really the best idea. First their baby doesn't sleep at night, Alex and Penny neither. Both start to see a woman and Alex thinks is a Hallucination due to lack of sleeping. While at supermarket Alex asks a clerk to be their babysitter which she agrees. The first night the babysitter see also the woman and misteriously dissapear after been attack. When Alex and Penny wake up they have slept 2 days and Penny began to fight because the babysitter is gone and the baby diaper has not been change since 48 Hrs prior. Since their move to the New house during the day there too much noise due to a construction near by. So they cant also sleep during the day. Alex and Penny relationship continues to deteriorate that both are afraid of each other. At the end Penny found the woman is real and tries to kill her.