For example, jumping spiders appear to exhibit remarkable diversity in the spectral sensitivities of their principal eyes, ranging from UV-green dichromacy through trichromacy
to tetrachromacy (Blest et al.
involves reduced sensitivity to one of the three cone pigments and includes protanomaly, deuteranomaly and tritanomaly in which the spectral sensitivity of the red, green and blue cone receptors is altered.
All types of red-green deficiency are caused by loss of a photopigment gene needed for normal trichromacy
The experiment was not properly designed to test trichromacy
, and does not provide evidence for its support.
Berman and Clear highlight what they believe to be errors in our statistical analyses and misunderstandings in our application of trichromacy
Steward and Cole (1) carried out a survey to assess the difficulties that are reported by colour deficient observers and concluded that anomalous trichromacy
is a nuisance but dichromacy is a serious problem.
Furthermore, other scientists have found some surprising possible consequences of the evolution of trichromacy
17) A considerable percentage of people with anomalous trichromacy
will report seeing both digits.
of human vision permits the mixing of three spectral primaries to create white light.