The most important thing is that we can see. Without sight it is very hard to recognise the world. However people who are blind, adapt to their environment and recognise even the smallest amount of sound they hear and adapt it to what it is.
we need convex lens in eyes as convex lens bulges out and thus focuses the outside light rays at a particular point in our eye, so then only we are able to see.
the lerns i you eyes are the contct lens it help you see at any way you wan it
which organisms have more than one lens in their eyes ?
retina
In the eyes.
They don't need to. The eyes are covered by a clear protective 'lens' - called the 'brille' which prevents dust etc getting to the actual eyeball.
convex
Yes- but not in the lens
a lens magnifies an object by using the pupal of your eyes and the glass from the lens to look up close. a lens magnifies an object by using the pupal of your eyes and the glass from the lens to look up close.
Probably, you would need your own prescription from your opticians for the correct contact lens'
I don't think it is OK to wear contact lenses if your eyes are not damaged because then you don't need them. All they will do is damage your eyes and when you are wearing them you wont be able to see because you need a prescription/its not the right prescription!
convex shaped or biconvex