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To the Editor:
David Pogue's State of the Art column, "Hi-Tech Eyeglasses, Not Made by Google" (July 11) reports on new glasses that may cure red-green colorblindness.
Anyone who has viewed through a colored filter, whether colorblind or not, knows that the perception of color is altered. This alteration may allow a colorblind person to distinguish colors that are otherwise indistinguishable with the unaided eye, but it can also simultaneously create another batch of colors that can no longer be discriminated.
Although a colored filter may permit a colorblind person to pass a color vision test, his color vision is probably not improved and may be degraded in certain regions of the color spectrum.
STEVEN H. SCHWARTZ
New York, July 11, 2013
The writer is a professor at SUNY College of Optometry.
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