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Ciliary Muscles

Ciliary muscl...

Question

Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

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Solution

Stretching or relaxing the ciliary muscles enables to adjust the focal length of the eyelens. Varying focal-length of the eyelens helps in forming the images of objects at different distances on the same retina.

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Similar questions

Q. Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?

Q. You are given that the diameter of the eyeball is about

2.3

cm and a normal eye can adjust the focal length of its eye lens to see objects situated anywhere from

25

cm to an infinite distance away from it.

What is the power of the (normal) eye lens, when ciliary muscles are fully relaxed?

What is the power of the (normal)eye lens, when ciliary muscles are in their maximum contract position?

The maximum variation in the power of the eye lens, when it adjusts itself, from the normal relaxed position to the position where the eye can see the nearby object clearly?

Relaxation of the ciliary muscles causes the focal length of eye lens to:

Q. When the ciliary muscles are relaxed, the focal length of the eye lens

Q. (a) Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
(b) Describe the working of the human eye with the help of the above diagram.
(c) How does the eye adjust itself to deal with light of varying intensity ?

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