Question

how does the eye-lens differ from the ordinary convex lens made of glass

Answer 1

Eye lens is made up of living cells, whereas a convex lens ismade of glass. Eye can change its focal length whereas the focal length of a convex lens is fixed. Stereoscopic vision of eyesallows three-dimensional images while a convex lens forms only two-dimensional images

Answer 2

hey.....

As convex eye lens is made up of fibrous flexible jelly like transparent material. it can change the focal length of the eye by relaxing and contracting. it allows us to see things 3-dimensionally. since, a normal convex lens is made up of glass.it cannot change its shape, as it is a solid. it allows us to see things 2-dimensionally.   

hope it's help ✌