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S&P4 - o Two thirds of light goes thru cornea and...

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2/15/11 o Two thirds of light goes thru cornea and are refracted o Misshapened cornea create stigmatism o Cornea-clear o Behind cornea is the aqueous humor providing nutrients to the eye, fluid makes bulge o Higher the pressure can create glaucoma Air puff test tests this o Pupil and iris are the same level o All light goes through pupil o Iris is pigmented ring of muscles that will help constrict, dilate pupil o Lens crystalline protein that focus for size o Lose ability to accommodate when get older o Vitreous humor provides nutrients to retina- goupy stuff o Retina is located at the back of the eye where all the neural functioning occurs o Photo receptors: rods and cones o Can A Pretty Lady/Lad Vacuum Rugs Really Clean? Retina o Neuronal tissue- displaced piece of CNS o One of the most metabolically active- more so than the brain o Anterior and posterior blood supply o Susceptible to oxidative damage because a lot of free radicals, etc o Retinal pigment epithelium (RPE)- behind the retina, black, absorbs a lot of the light that gets past the retina o Focuses light better o Gets rid of byproducts- Lysosomal o Retinitis Pigmentosa if RPE doesn’t get rid of byproducts, first affects rods, pigment clumps, kills off photoreceptors o Diabetic Retinopathy- macula hemorrhage and aneurysms
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Blood vessels burst and leaks out distorting visio Can correct by putting microchip where retina used to be or visual prosthesis- vest o Retinal cell layers 1. Ganglion Cell Layer 2. Bipolar Cell Layer 3. Photoreceptor Layer o Horizontal (connect photoreceptors- providing additional communication) and Amacrine cells- in between layers o Macular pigment- dietary carotenoids yellow made of eat leafy green o filters short wave blue light (one of the most damaging so protecting filter) so good if you have more o 0.3-0.6 o Connected to body fat concentrations so related to obesity o Recover and see better with blast of headlights o Anterior to photoreceptors o If not a lot of macular pigment then susceptible to macular degeneration and more damage to photoreceptors (AMD) Fatty clumps in eye and then lose vision central first First dry then wet Luiteen and cetozantha o Central fovea o Cones centrally located, Photopic vision (color, daytime) o Rods peripherally located and longer, scotopic vision (night) o
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