NEUROLOGY
VISUAL FIELD DEFECTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The lens moves in or out according to the position of the object
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The retina moves in or out according to the position of the object
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The lens becomes thicker or thinner according to the position of the object
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The pupil gets larger or smaller according to the position of the object
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Detailed explanation-1: -The thickness and shape of the lens are changed by the Ciliary muscles that help in focusing on objects at different distances. The lens gets thinner to focus on distant objects and vice versa.
Detailed explanation-2: -Muscles in the ciliary body enable the flexible lens to alter its shape and allow the eye to focus on objects at varying distances. When you look at a tree far away, for instance, the muscles relax and stretch the zonule ligaments, which in turn pull on the lens, causing it to flatten and assume a thin contour.
Detailed explanation-3: -When you are looking at objects closer to the eye, the ciliary muscles contract. This increases the curvature of the eye lens. The eye lens then becomes thicker.