Terms in Medical Condition
A- Achromatopsia (5)
A person suffering monochromacy sees the world in shades of gray. There are a number of forms of monochromacy. Rod Monochromacy, complete achromatopsia, is total color blindness. Cone monochromacy is another form of complete achromatopsia, but with normal visual acuity. Blue cone monochromacy is also known as incomplete achromatopsia. There is also cerebral achromatopsia, which is also called atypical achromatopsia.
- Americans with Disabilities Act (1)
- Anomalous Trichromacy (4)
One or more of the three cone types are not fully functional.
- assistive technologies (3)
D- Deuteranomaly (4)
A person with deuteranomaly is green-weak. The weakness can range from near normal vision to deuteranopia. The green sensitive cones are not missing, but the peak sensitivity shifts towards the red sensitive cones. Deuteranomaly is the most common form of color blindness affecting about 5% of the male population and 0.35% of the female population.
- Deuteranopia (4)
An individual affected with deuteranopia is missing the medium-wavelength cones. A deuteranope only distinguishes two to three different hues, where a person with normal vision see seven different hues. Deuteranopia is green blindness and effects about 1% of the male population, and 0.1% of the female population.
- Dichromacy (4)
Two of the three cone types are functioning.
| P- Protanomaly (4)
Individual affected with protanomaly have defective long-wavelength cones (L-Cones). The degree to which the cones are defective results in stronger or weaker color blindness. An individual with protanomaly falls in the color blindness category of anomalous trichromats.
- Protanopia (4)
Protanopia refers to the lack of long-wavelength cones (L-cones) in the retina of the eye. It is a genetic condition in which the affected person is less sensitive to red light. The affected person is a dichromat, as they have two working cone types (short-wavelength and medium-wavelength). Approximately 1.01% of the male population and 0.02% of the female population are affected by protanopia.
T- Tritanomaly (4)
With tritanomaly, the short-wavelength cones are present but are damaged to some degree. In addition to the genetic factor, tritanomaly may result from aging, alcoholism, organic solvents, and head injury. Tritanomaly affects about 0.0002% of the male and female population.
- Tritanopia (4)
With tritanopia, the short-wavelength cones are missing. Often referred to as blue-yellow color blindness, a more accurate term is blue-green color blindness. Tritanopia occurs equally in the male and female population with 0.0001% of each being affected.
|
|
