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To the Editor:
—I should like to make a few comments on "Problem in Refraction," published in the November issue of the Archives (page 1011). It seems to me that the problem could be more effectively analyzed if the findings were all reduced by transposition to contain the cylinder of the same kind, plus or minus. In this way the range of variation in both the sphere and the cylinder and the tendency of the variations can be more easily seen and understood.With this method the following results for the right eye are obtained for the six findings, numbered 1 to 6, the correction the patient came with being eliminated. The letter O is used for objective findings and the letter S for subjective findings.It is seen that the sphere varies between +0.25 and -1.50, a variation of 1.75 D., whereas the cylinder varies only between -0.50
Pascal JI. "PROBLEM IN REFRACTION". Arch Ophthalmol. 1941;25(1):155–156. doi:10.1001/archopht.1941.00870070169020
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