blindness, also known as daltonism, is a deficiency in the view of
certain colors. Our retina
is made up of rods and cones, which act as color and light
receptors. Each of the millions of cones are made up of 3 more receptors:
red, green and blue. When functioning correctly, we can see all types
of color; color blindness occurs when there is a problem or lack
of a color receptor in the cones. Red/green color distortion is
the most common type of color vision impairment. In a few very rare
cases, some people can only see in black and white shades.
blindness is almost always an inherited condition although
males are more likely than females to get it. Cones in our eye contain
red, green and blue pigments. When there is damage to one of the cones
or a cone is missing some of the pigment, color blindness occurs.
to distinguish colors (usually red/green and sometimes yellow/blue)
blind person may not see the digit 8 in the picture below.
some color blind people, special contacts to can with color vision.
Unfortunately, there is not a treatment to completely cure color blindness.