How An Eye Works
Its easy
to understand the eye when
you compare it to your
camera.
The eye is
like a
camera in which
lenses focus the picture on
a light sensitive film.
In the
human eye the transparent
cornea
and
lens focus images
on the
retina, a thin light
sensitive film which
receives light and changes
it into electrical signals
which are then transmitted
to the brain by the
optic nerve.
Just in
front of lens lies the
iris
('colored portion of the
eye- to help you understand
, Aishwarya Rai has a
slightly green iris !!!)
with a central opening - the
pupil. This is
just like the shutter or
diaphragm aperture of the
camera and helps regulate
the amount of light entering
the eye.
The
sclera ('white of
the eye') is the protective
outer coat of the eye.
Between the sclera and the
retina lies the
choroid, which
has a chiefly nutritive
function. The space between
the lens and the retina is
filled with a clear jelly
called the
vitreous body.
