Question

Describe and explain, how a normal eye can see objects lying at various distances clearly.

Answer 1

Power of adaptation is the eye's ability to focus adjacent and distant points on the retina by altering the focal length of the eye lens. The ciliary muscles that contract or relax the lens of the eye and therefore help to adjust its focal length.  

Explanation:

A normal eye may clearly see objects placed at different distances, due to their accommodation capacity. Power of adaptation is the eye's ability to focus adjacent and distant points on the retina by altering the focal length of the eye lens. The ciliary muscles that contract or relax the lens of the eye and therefore help to adjust its focal length.  

(a) If the eye focuses on a distant target it is said to be uncomfortable.

• The muscles of ciliary are relaxed, and because of that the suspensory ligaments are tightly drawn, which in turn pulls the eye lens.
• The lens of the eye is thin, and its converging strength is the.
• The limited converging force is enough to combine the parallel rays of light from the distant object to form a picture on the retina.  

(b) It's said to be prioritised while the eye is focused on a nearby object. The muscles of ciliary contract, the suspensory ligaments can’t be pulled tightly because of this.

• Since the suspensory ligaments are loose, they avoid pulling the lens of eye which causes the eye lens to become thick or bulge.
• The dense eye lens has better converging strength, which helps align the light rays diverging from the surrounding object to form a picture on the retina.

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