HTHSCI 1H06 Lecture Notes - Lecture 4: Vitreous Body, Aqueous Humour, Superior Colliculus
29 Nov 2016
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Document Summary
Blood vessel coat: choroid, ciliary body, iris. Refractive media: bends the light and shines on to the retina. Detection of light through the retina and send it to the thalamus and superior colliculus, sends to the cerebellum, perception of object. Normal vision depends on the shape of the cornea and sclera. Light comes in through cornea (bends, 80%) focuses through lens (20%) Hyperopia (60%): farsightedness, image is elongated, eyeball is flattened, diff seeing. Myopia (20-30%): eye is elongated, visual pathway is shortened, diff seeing far. Away, corrected by negative diopters, concave lens, makes things smaller, Cornea: collagen bundles, protein that is stiff, composed of tears (water) + epithelium on the outside, stroma in the middle and endothelium + aqueous humor on the inside. No water should be in the stroma, epithelial layers should be getting rid of the water to make the cornea, crystal clear. All collagen fibers in the stroma run the same direction.
