Editing Luminous efficiency function (section)

=== Color blindness ===
[[File:LuminosityCurve3.svg|right|thumb|400px|Protanopic (red, dotted) and deuteranopic (green, dashed) luminosity functions.<ref name="judd">{{cite book|last=Judd|first=Deane B.|title=Contributions to Color Science|year=1979|publisher=NBS|location=Washington D.C. 20234|url=https://books.google.com/books?id=jgz_iI8NAzYC&pg=PA316|page=316}}</ref> For comparison, the standard photopic curve is shown (black, solid).]]
[[Color blindness]] changes the sensitivity of the eye as a function of wavelength. For people with [[protanopia]], the peak of the eye's response is shifted toward the short-wave part of the spectrum (approximately 540&nbsp;nm), while for people with [[deuteranopia]], there is a slight shift in the peak of the spectrum, to about 560&nbsp;nm.<ref name="judd" /> People with protanopia have essentially no sensitivity to light of wavelengths more than 670&nbsp;nm.