====== Color Vision Deficiency ======

==== Classification ====

=== Red-Green Color deficiency ===
  * Deutan
    * 6% of males
    * Defect in M-opsins for medium wavelength sensitive cones
    * Deuteranomaly 
      * most common
      * a type of anomalous trichomacy 
      * abnormal function of green cones
    * Deuteranopia 
      * A type of dichromacy 
      * non-functioning green cones
  * Protan
    * 2% of males 
    * Defect in L-opsins for long wavelength sensitive cones
    * Reduces the sensitivity of red light
    * Protanomaly 
      * a type of anomalous trichomacy 
      * abnormal functioning red cones
    * Protanopia
      * A type of dichromacy 
      * non-functioning red cones

=== Blue-Yellow Color deficiency (Tritan) ===
  * defect in S-opsins for short wavelength sensitive cones 
  * Tritanomaly 
    * a type of anomalous trichomacy
    * abnormal function of blue cones
    * difficulty discerning between blue and green and between yellow and red
  * Tritanopia
    * A type of dichromacy 
    * non-functioning blue cones
    * unable to discern between blue and green, purple and red, yellow and pink

=== Blue Cone Monochromacy ===
  * non-functioning red and green cones
  * only blue cones function
  * central vision is significantly affected

=== Complete Color Deficiency ===
  * Achromatopsia (monochromacy)
    * no functioning cones 
    * Central vision usually affected
    * accompanied by nystagmus in congenital disease