What is color blindness? Color blindness is a vision problem
that makes it hard to tell the difference between certain
colors. It does not mean that you cannot see any colors. That is
very rare. Most color-blind people have trouble with just 1 or 2
colors, most commonly red and green. Shades of red and green
might look brownish to a color-blind person. How does it occur?
You see in color because the retina at the back of the eye has
special cells called cones. There are 3 types of cones: cones
for red light, cones for green light, and cones for blue light.
These 3 types of cones mix the colors together to create all of
the colors people see. In a color-blind person, the red and
green cones are very similar. This causes an abnormal mix of
color and color confusion. Color blindness is usually inherited.
A woman can be a "carrier" of the gene but will usually not be
color blind herself. Men cannot be just carriers of the gene. If
a man has the color blindness gene then he is color blind. Men
are more commonly co