Editing Color blindness (section)

====Anomalous trichromacy====
Anomalous trichromacy is the mildest type of color deficiency{{Citation needed|date=February 2025}}, but the severity ranges from almost dichromacy (strong) to almost normal trichromacy (mild).<ref>{{cite journal | vauthors = Simunovic MP | title = Colour vision deficiency | journal = Eye | volume = 24 | issue = 5 | pages = 747–55 | date = May 2010 | pmid = 19927164 | doi = 10.1038/eye.2009.251 | doi-access = free }}</ref> In fact, many mild anomalous trichromats have very little difficulty carrying out tasks that require normal color vision and some may not even be aware that they have a color vision deficiency. The types of anomalous trichromacy include protanomaly, deuteranomaly and tritanomaly.  It is approximately three times more common than [[dichromacy]].<ref>{{Cite journal |doi=10.1016/j.gde.2006.04.002|title=Genetics of variation in human color vision and the retinal cone mosaic|year=2006|last1=Deeb|first1=Samir S.|journal=Current Opinion in Genetics & Development|volume=16|issue=3|pages=301–307|pmid=16647849}}</ref> Anomalous trichromats exhibit [[trichromacy]], but the color matches they make differ from normal trichromats. In order to match a given spectral yellow light, protanomalous observers need more red light in a red/green mixture than a normal observer, and deuteranomalous observers need more green. This difference can be measured by an instrument called an [[Anomaloscope]], where red and green lights are mixed by a subject to match a yellow light.<ref>{{cite journal|doi=10.1016/0042-6989(79)90209-8|title=Optimization of a Rayleigh-type equation for the detection of tritanomaly|year=1979|last1=Moreland|first1=J.D.|last2=Kerr|first2=J.|journal=Vision Research|volume=19|issue=12|pages=1369–1375|pmid=316945|s2cid=29379397 }}</ref>