This link has been bookmarked by 14 people . It was first bookmarked on 09 May 2008, by Chris Heumann.
-
19 Oct 14
-
As the eye's main focusing element, the cornea takes widely diverging
rays of light and bends them through the pupil, the dark, round opening in the center of the
colored iris. The iris and pupil act like the aperture of a camera.
-
-
03 Jan 12
-
14 Dec 11
-
Iris
Inside the anterior chamber is the iris. This is the part of the eye which is responsible for one's
eye color. It acts like the diaphragm of a camera, dilating and constricting the pupil to allow
more or less light into the eye. -
Next in line is the lens which acts like the lens in a camera, helping to focus light to the back
of the eye. Note that the lens is the part which becomes cloudy and is removed during cataract
surgery to be replaced by an artificial implant nowadays.
The Camera The Human Eye -
-
-
25 May 11
-
09 Dec 10
-
19 Sep 10
-
So think of the eye as a camera with the cornea, behaving
much like a lens cover. -
he cornea takes widely diverging
rays of light and bends them through the pupil, the dark, round opening in the center of the
colored iris. The iris and pupil act like the aperture of a camera -
The very back of the eye is lined with a layer called the retina which acts very much like the
film of the camera. -
The photoreceptor nerve cells of the retina change the light
rays into electrical impulses and send them through the optic nerve to the brain where an
image is perceived. -
As with the camera, if the "film" is bad in the eye (i.e. the retina), no matter how good
the rest of the eye is, you will not get a good picture. -
The human eye is remarkable. It accommodates to changing lighting conditions and focuses
light rays originating from various distances from the eye. When all of the components of the
eye function properly, light is converted to impulses and conveyed to the brain where an
image is perceived.
-
-
09 May 08
Would you like to comment?
Join Diigo for a free account, or sign in if you are already a member.