Why is it possible to see the cells that are on the outside of the eye?

Question

I always see cells floating around in little clusters and I was wondering how it could possibly be happening.

Answer 1

Floaters are usually the result of bits of cells that remain in the vitreous humor after birth and float around when the vitreous becomes more liquified later in life. The shapes are shadows projected onto the retina by tiny structures of protein or other cell debris discarded over the years and trapped in the vitreous humour.

Answer 2

Those aren't cells. It is probably just dust specks.