(a) (i) Circular muscles of the Iris contact while radial muscles relax reducing the size of the pupil, causing less light enters the eye.
(ii) The retina is protected from damage from too much light
(b) Choroid has a dense network of blood capillary from which nutrients diffuse out to supply the eye.
(c) The blind spot has no photoreceptors cells i.e. rods and cones, hence no impulses are generated to be transmitted to the brain for interpretation.
johnmulu answered the question on May 24, 2017 at 06:51
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