Question

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

Answer 1

The original eye lens can adjust its focal length by the help of eye muscles "ciliary. While the ordinary convex lens made by the glass can not adjust its focal length. This is the difference between eye lens and the ordinary convex lens made of glass. 

Answer 2

The convex eye lens can change its focal length as per the surroundings as per the culinary muscles and has the power of accommodation whereas the focal length of a convex lens made of glass can't be changed

Answer 3

The convex eye lens can change its focal length as per the surroundings as per the culinary muscles and has the power of accommodation whereas the focal length of a convex lens made of glass can't be changed