Presbyopia is due to the diminishing ability of:

ciliary muscles

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retina

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lens

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iris

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Solution

The correct option is A
ciliary muscles

Power of accommodation is the ability of ciliary muscles to adjust the focal length of eye lens by changing its shape. When eye has a defect called presbyopia, this ability of ciliary muscles diminishes. The near point of eye lens becomes greater than 25 cm. This defect is very common in elderly people.

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Similar questions

(a) Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve and Blind spot.

(b) What are the functions of the following parts of the eye?

(i) Iris (ii) Eye-lens (iii) Ciliary muscles (iv) Retina (v) Optic nerve

The change in focal length of an eye lens is caused by the action of the

(a) pupil

(b) retina

(d) iris

Q. Due to gradual weakening of ciliary muscles and diminishing flexibility of the lens a certain defect of vision arises. Write the name of this defect . Name the type of lens required by such persons to remove the vision. Explain the structure and function of such a lens.

Q. Muscles of iris and ciliary body originate from

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