Deuteranopia
Deuteranopia: Colorblindness of the red-green type, also known as deuteranomaly or Daltonism.
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 in poor circumstances. 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’s reputation largely rests upon his great Atomic Theory. It was said of Dalton that “into society he rarely went, and his only amusement was a game of bowls on Thursday afternoons.”
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.
Read Also:
- Deuterium
Deuterium: A non-radioactive isotope of hydrogen that contains a neutron in its nucleus in addition to the one proton normally seen in hydrogen. A deuterium atom is twice as heavy as normal hydrogen.
- Development, Human, . . . (NICHD)
Development, Human, National Institute of Child Health and (NICHD): One of the US National Institutes of Health, NICHD is in a sense the NIH for kids in that it is concerned with child health. The mission of the NICHD is, in formal terms, to support and conduct “research on fertility, pregnancy, growth, development, and medical […]
- Development
Development: The process of growth and differentiation. The most important stage of human development occurs before birth, as tissues and organs arise from differentiation of cells in the embryo. This process continues until birth, and interruptions in development result in the most serious types of birth defects, such as anencephaly and spina bifida. The developmental […]
- Developmental delay
Developmental delay: A condition in which a child is behind schedule in reaching milestones of early childhood development. This term is often used as a euphemism for mental retardation, which can be less a delay than a permanent limitation of a child’s ability to progress.
- Developmental dislocation of the hip (DDH)
Developmental dislocation of the hip (DDH): The abnormal formation of the hip joint in which the ball at the top of the thighbone (the femoral head) is not stable within the socket (the acetabulum). The ligaments of the hip joint may also be loose and stretched. The degree of instability or looseness varies. A baby […]