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To the Editor:
—Dr. David I. Mirow's request (Cross Cylinder Test, Arch. Ophth. 43: 1088 [June] 1950) for better teaching of the crossed cylinder test is long overdue. The test for axis is immeasurably superior to all others; and the test for strength is almost equally good when certain safeguards are borne in mind. I would refer Dr. Mirow to an article by his fellow countryman, Dr. W. H. Crisp, of Denver, Colo. (Tr. Ophth. Soc. U. Kingdom51: 495, 1932; Am. J. Ophth. 15: 729 [Aug.] 1932).In the same journal (Tr. Ophth. Soc. U. Kingdom59: 139, 1949) I drew attention to this excellent description of the crossed cylinder. For the life of me, I cannot understand why people do not use crossed cylinders in subjective refraction work (especially in the finding of the axis), for it can be shown that a crossed cylinder makes it six times
Purvis V. THE CROSSED CYLINDER TEST. AMA Arch Ophthalmol. 1951;45(1):121. doi:10.1001/archopht.1951.01700010124014