The numbers about people affected by color deficient vision
are based on:
Birch, J. 1993. Diagnosis of Defective Colour Vision.
Oxford University Press, 204 pp.
Piantanida, T. 1991. Genetics of inherited colour vision
deficiencies, in: Inherited and acquired colour vision
deficiencies: Fundamental aspects and clinical studies,
88-114, ed. by Foster, D. H., Keele, UK.
Pickford, R. W. 1959. Some heterozygous manifestations of
colour blindness. British Journal of Physiological Optics,
16:83-95.
Pokorny, J., Smith, V. C., Verriest, G. and Pinkers, A. J.
L. G. (eds.) 1979. Congenital and acquired color vision
defects. New York: Grune & Stratton.
