A blind spot in the visual field,
which may be caused by a variety of
disorders affecting the retina or the optic nerves. A "blind spot" may be one-sided or bilateral and sometimes not appreciated
until a specialist performs full visual field testing.
Color scotoma may
occur when certain areas of the retina are
insensitive to color vision. This may be acquired
through damage to the
nerve fibers brought about by optic neuritis---itself caused by a large number of conditions: diseases such as anemia, multiple sclerosis, and diabetes mellitus; abuse of tobacco or alcohol;
chemical toxicity; and vitamin deficiencies.
Treatment of the neuritis is directed
toward the cause, and in some cases recovery is possible if the
condition is not progressive.