A bit of chatter today about http://www.4colorvision.com/:
This site presents the new, and COMPREHENSIVE
ELECTROLYTIC THEORY OF THE VISUAL PROCESS…. The theory shows that the ARCHITECTURE OF ALL VISION IS TETRACHROMATIC. Although traditionally called trichromats, it is shown that HUMANS ARE BLOCKED TETRACHROMATS.
Etc., etc., etc.
Apparently, this theory says that the human retina is sensitive to ultraviolet light, but the lens is opaque to ultraviolet. Except for the lucky(?) few who’ve had one or both lenses removed, we’re all UV-blind.
I’m UV-blind? I never knew. I’m just devastated.
There may be some interesting or useful science behind http://www.4colorvision.com/, but to me it smells more like just another crackpot site, like http://www.aspartamekills.com/.