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To the Editor:
—In an effort to display via projection, lines, tables or charts, many speakers choose to illustrate with as many varied colors as possible. This naturally adds to the impact of the lecture. For many years it has been almost painfully obvious to me that projected material colored blue appears more "fuzzy" or "hazy" than do other colors. This phenomenon is much more apparent when the slide projected has blue lines or printing on a completely black background. Relaxation of accommodation by an emmetrope or myope cannot clear up this blurred image, nor can it be compensated for by refocusing the projector. A myopic individual such as myself is probably more apt to notice and be disturbed by this fuzz. Hyperopes are likely to clear the blur by relaxing the accommodation, and thus not be bothered by it.Of course, this blur-for-blue phenomenon is the eye manifestation of
Rubin ML. COLORED PROJECTION SLIDES. Arch Ophthalmol. 1963;70(5):735. doi:10.1001/archopht.1963.00960050737027