In the human eye,the focusing is done by:

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(C) The human eye focuses on objects at varying distances through a process called accommodation.This is achieved by the ciliary muscles,which adjust

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Change in the convexity of the lens surface

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(C) The human eye focuses on objects at varying distances through a process called accommodation.This is achieved by the ciliary muscles,which adjust the shape (convexity) of the crystalline lens.When the ciliary muscles contract,the lens becomes more convex (thicker),increasing its power to focus on nearby objects.When the ciliary muscles relax,the lens becomes less convex (thinner),decreasing its power to focus on distant objects.Therefore,the correct mechanism is the change in the convexity of the lens surface.

$(I)$ Presbyopia	$(A)$ Sphero-cylindrical lens
$(II)$ Hypermetropia	$(B)$ Convex lens of proper power may be used close to the eye
$(III)$ Astigmatism	$(C)$ Concave lens of suitable focal length
$(IV)$ Myopia	$(D)$ Bifocal lens of suitable focal length

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