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Question
In mammalian eye, the power of accommodation is controlled by changing thickness of the lens, governed by
In mammalian eye, the power of accommodation is controlled by changing thickness of the lens, governed by
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Solution
The correct option is D Ciliary body
A. Cornea is the anterior portion of eye which maintains the shape of eye and also protects it.B. Pupil is an aperture in eye which is surrounded by iris. Light enters the eye through pupil.C. Iris surrounds the pupil and regulates the amount of light entering the eye by controlling the size of pupil. It has cells of varying colours and hence imparts colour to the eye.D. Ciliary body is a part of middle layer of eye. It consists of ciliary muscles which adjust the shape of lens.Power of accommodation is the change of focal length by eyes to focus distant or nearby objects. It is controlled due to change in lens shape by ciliary body.So, the correct answer is 'Ciliary body'.
A. Cornea is the anterior portion of eye which maintains the shape of eye and also protects it.
B. Pupil is an aperture in eye which is surrounded by iris. Light enters the eye through pupil.
C. Iris surrounds the pupil and regulates the amount of light entering the eye by controlling the size of pupil. It has cells of varying colours and hence imparts colour to the eye.
D. Ciliary body is a part of middle layer of eye. It consists of ciliary muscles which adjust the shape of lens.
Power of accommodation is the change of focal length by eyes to focus distant or nearby objects. It is controlled due to change in lens shape by ciliary body.
So, the correct answer is 'Ciliary body'.
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