Answer 1:
Well, they help you see clearer for the same
reason a telescope works so well. Light rays
become bent when they travel through glass...and
the thicker the glass the more they get bent. So
as light moves through a glass lens, the light
entering the lens along the edge is bent LESS than
the light going through the center. It is this
differential bending of light that COMPENSATES for
the mis-shape of the lens in your eye!!!! so the
important point is that the contact lens or the
glasses you wear are IN FRONT OF YOUR EYE. The
closeness is not so important; the key is that the
correction to the bending of the light rays is
made BEFORE the light actually enters your
eye.
|
Answer 2:
Your question implies that you know that some
distance is needed for a lens to focus an image.
It would seem then that since the contact lenses
are touching the eye, then there is no distance
for the focusing to occur.
You should think
about how the eye is put together. The eye is a
ball. On one side of the ball is the eye's lens;
on the other is the retina, which are the nerves
that detect light. In between, in the center of
the ball, is clear fluid. Light going through
theeye's lens is focused onto the retina creating
a sharp image.
How will a contact lens help
this if your lens doesn't work correctly?
Click Here to return to the search form.
|
