P3 - How Our Eyes Work (I) 0.0 / 5 ? PhysicsMedical PhysicsGCSEEdexcel Created by: kat-yCreated on: 07-11-16 17:27 What is the retina? Tissue at the back of the eye that contains light receptors 1 of 11 What do the lenses do? converge light rays refracted by the cornea to be focused on the retina 2 of 11 The iris is a ....ring that.....the size of the pupil to control how much light.....the eye coloured, controls, enters 3 of 11 The pupil is a round.....in the.....of the iris hole, centre 4 of 11 What does the pupil do? It changes size in response to the changes in light levels 5 of 11 When in a bright room the pupil...... Constricts to allow less light into the eyes 6 of 11 Why is it important that the pupil is able to control how much light enters the eye? It prevents damage to the retina 7 of 11 What do the ciliary muscles do? Relax or contract to change the shape of the lens of the eyes 8 of 11 The outer transparent layer of the eye is the...... Cornea 9 of 11 What does the cornea do? It refracts light entering the eye 10 of 11 When the iris becomes smaller, the pupil..... Widens to let in more light 11 of 11
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