During accommodation, pupillary dilation partially compensates for the reduced size of the retinal image by:
A) Thickening the lens
B) Contracting the ciliary muscle
C) Increasing light entering the pupil
D) Narrowing the palpebral opening
Ans: C
Feedback:
Accommodation is the process whereby a clear image is maintained as gaze is shifted from far to near objects. During accommodation, pupillary dilation partially compensates for the reduced size of the retinal image by increasing the light entering the pupil. Accommodation requires convergence of the eyes, pupillary constriction, and thickening of the lens through contraction of the ciliary muscle, which is controlled mainly by the parasympathetic fibers of the oculomotor cranial nerve (CN III). A third component of accommodation involves reflex narrowing of the palpebral opening during near vision and widening during far vision.
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