Definition of Daltonism Daltonism: Colorblindness of the
red-green type (also known as deuteranopia or deuteranomaly). The
term "Daltonism" is derived from the name of the chemist and
physicist, John Dalton (1766-1844). Dalton was born in a village in
Cumberland, England where his father, Joseph, was a weaver. He was educated
by his father and John Fletcher, teacher in a Quaker school. When Fletcher
retired in 1778, Dalton took his place. In 1793 he was appointed teacher of
mathematics and natural philosophy at New College in Manchester. In 1803 he
put forth the facts embodied in his law of partial pressures: the pressure of
a mixture of gases is the sum of the pressures which would be exerted
separately by the several constituents if each alone were present. Dalton
described his and his brother's affliction of colorblindness with defective
perception of red and green in the first scientific paper he published. It
was entitled "Extraordinary facts relating to the vision of colours,
with observation" (Mem Literary Philos Soc Manchester 5: 28-45, 1798).
It is the first recognized account of red-green colorblindness. Red-green
colorblindness:
A form of colorblindness in which red and green are perceived as identical.
This is the most common type of colorblindness. It is inherited in an
X-linked recessive manner and affects 6% of males. It is also known as deutan
colorblindness, deuteranopia, and Daltonism. Color
blindness Types
and the worlds of color blindness |