What is a cataract?
It may be a cat's nickname.
No.
A cataract is an eye disease.
How does it form?
Wait.
I will explain.
Each of our eyes consists of a transparent lens.
Is it similar to my camera lens?
Absolutely.
Our eye lens is made up of water and protein.
They are arranged in such a way that keeps the lens clear, and lets light pass through it.
Hence, a sharp image is formed on the retina.
However, as we age, the protein begins to clump together, making the lens cloudy.
This clouding of our eye's natural lens is called a cataract.
In such situations, when light from an object enters our eye, the clumped protein blocks or scatters the light.
As a result, a blurred image is formed on the retina, thus making it hard to see.