SCI227 Lecture Notes - Lecture 15: Aqueous Humour, Color Blindness, Sclera
Document Summary
The structure of the eye the eye has three separate layers: sclera, choroid, retina, the sclera: Is the tough, white outmost layer of the eye. Is a mucous membrane that covers the sclera and keeps it moist: choroid layer, middle layer of tissue in the eye. It contains many blood vessels that nourish the retina: the retina, contains photoreceptors which have pigment molecules that absorb light. It then hits the retina exciting the photoreceptors: the cornea: It is the front transparent part of the sclera. It contains no blood vessels it absorbs oxygen from gases dissolved in tears: aqueous humour: It supplies the cornea with nutrients & removes wastes. It controls the size of the pupil and the amount of light that enters the eye. If it contains the pigment melanin the eyes are brown, without pigment the eyes appear blue: the lens, focuses the image on the retina, changes shape when viewing objects.
