Question

In the eye, what is the lens and what does it do?

Answer 1

Eye lenses/ lens crystallin/ aquula is a biconvex structure in the eye and it helps to refract light.

Explanation:

The lens changines shape so that it can focus on objects at various distances. As a result a sharp, real image of the object formes on the retina. This is known as accommodation.

On the picture we can see light from a single point of a distant object and light from a single point of a near object being brought to a focus. This changes the curvature of the lens.

"In humans, the optical power* of the lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power."

*a degree to which optical system converges or diverges light