Question

What is the shape of the lens during (1) near vision, (2) distant vision?

Answer 1

Lens:

1. The lens is the main refractive medium of the human eyes.
2. The lens is elastic in nature and biconvex in shape.
3. It remains suspended from ciliary bodies by a suspensory ligament in the eyeball.
4. It helps to focus on objects based on distance.

Shape of lens:

1. Near vision: While seeing a nearby object, the ciliary muscle contract, and the lens become thick and convex.
2. Distant vision: While seeing distant objects, ciliary muscles, relax, and the lens becomes elongated and thinner.