Hormones, Eye, Sensitivity 0.0 / 5 ? BiologyHormones, Eye , SensitivityIGCSEAQA Created by: SophieP562Created on: 27-10-17 12:35 What do eyes in light do pupils need to get small so radinal cells do not over excited. Circular muscles contract to make iris thicker 1 of 9 What do eyes do in darkness need to get bigger so enough light can reach the retina to form an image. Radinal muscles contract to make iris thinner 2 of 9 Conjuctiva Lubricates and protects the surface of the eye 3 of 9 Optic Nerve Carries electrical impulses from receptors to the brain 4 of 9 The Lens Focuses the light 5 of 9 pupil Lets the light into the eye 6 of 9 Iris Controls diameter of pupil 7 of 9 Sclera Tough outer surface of the eye which protects the eye 8 of 9 Retina Light sensitive rods and cones. Sends messages to optic nerve to send them ti brain 9 of 9
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