Question

Who is typically affected by monochromatic color blindness?

Answer 1

It typically refers to an autosomal recessive congenital color vision disorder, the inability to perceive color AND to achieve satisfactory visual acuity at high light levels.

Explanation:

Although the term may refer to acquired disorders such as color agnosia and cerebral achromatopsia, it typically refers to an autosomal recessive congenital color vision disorder, the inability to perceive color AND to achieve satisfactory visual acuity at high light levels (typically exterior daylight).
http://www.rightdiagnosis.com/a/achromatopsia/intro.htm

See also:
http://www.color-blindness.com/2007/07/20/monochromacy-complete-color-blindness/