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Letters |

A Photopic Imperfection of the Eye?

Stephen V. Chiavetta, MD; Charles W. G. Eifrig, MD
Arch Ophthalmol. 2011;129(7):965. doi:10.1001/archophthalmol.2011.155.
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We read the article by Fishman1 with interest. We agree with Darwin that immutable perfection is not the way evolution transpired.1,2 We describe a process that can remove 1 photopic imperfection of the eye.

The visual experience occurs when enough light energy from the electromagnetic spectrum falls within the different parabolic light absorption curves of the cone and rod cells to cause a photochemical reaction. The cone and rod cells needed to evolve in a way that created differences in absorptive sensitivity to light across a relatively narrow range of wavelengths for color to be appreciated. The steep slopes of these absorption curves give rise to peak absorptive wavelengths3 where the retina is particularly vulnerable to bleaching under photopic conditions.

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