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May 1951


Author Affiliations

Los Angeles.

AMA Arch Ophthalmol. 1951;45(5):605. doi:10.1001/archopht.1951.01700010617012

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To the Editor:  —A note in this journal (Zugsmith, G. S.: Use of Coated Lenses in Retinoscopy, Arch. Ophth.39: 383-385 [March] 1948) claims advantages with the use of coated trial lenses, many of which seem reasonable.The refractions of 100 patients were determined with the retinoscope, using both coated and uncoated lenses and trial case acceptance. It is stated that, especially with respect to the cylindric correction, "there was closer correlation between trial case acceptance and retinoscopic corrections with coated lenses. . . . However, more apparent than the statistical results was the ease with which retinoscopic examination was performed."The statistical results are, however, far from apparent, since neither the coefficient of correlation nor the differences with their probabilities are given. Data on only 17 (said to be "representative") of the 100 cases are recorded. The values for the cylinders and spheres of the 32 eyes were analyzed by us by

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