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To the Editor:
—I was much interested in the query of J. F. and the reply (The Journal, September 15), on Crookes lenses, particularly as I was a victim of a severe acute solar retinitis in 1911 from overexposure to tropical sunlight in army service, and since then a sufferer from the retinal asthenopia often a permanent sequela of this form of ocular injury.In my search for relief, I have run the gamut of protective optical lenses and the personal knowledge gained may be of interest.Crookes glass is now marketed in three shades, Nos. 1, 2 and 3, instead of the former Absorptions "A" and "B." Shade 2 in tint is between the former A and B. This glass is now and has been for some time the object of an intensive advertising propaganda by the optical interests generally; we are told now that American-made Crookes glass is
Waring JBH. "CROOKES LENSES". JAMA. 1923;81(13):1132–1133. doi:10.1001/jama.1923.02650130070025
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