Which among the following can be a reason for poor eyesight? (correct answer + 1, wrong answer - 0.25)
A
Inablity to contract iris
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B
Inablity to contract ciliary muscle
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C
Inablity to contract pupil
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D
Inablity to contract cornea
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Solution
The correct option is B Inablity to contract ciliary muscle The ciliary muscles are smooth muscles which are of circular and meridional type. These muscles alter the shape and lens during accommodation.
Suspensory ligaments are attached to the ciliary body, which in turn are attached to the capsule that surrounds the lens of the eye.
Due to the action of the muscles of the ciliary body and suspensory ligament, the focal length of the lens changes. This allows the objects to be focused in different intensity of lights from varying distances.