Talk:Photopsin
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It seems that the Rhodopsin article has much of the same information and is more complete.
[edit] Wavelength or frequency?
This article, like all literature on the subject, treats the -opsins in terms of wavelength. But is it wavelength they are sensitive to, or frequency? The law of refraction states that EM frequency remains the same, but wavelength does not, across a transition medium. The frequency of a particular light emitted in vacuum, which crosses into air, and then vitreous humor, is constant. The wavelength is not. --76.217.90.99 01:15, 4 May 2007 (UTC)