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Perhaps no two men entertain identical views, or have like experiences in all particulars in the matter of correcting ametropia. All fixed rules must bend to the inevitable exceptions, and certain general principles only can be said to obtain upon which experience and judgment found creditable results.
It was taught by Donders that it was seldom necessary to correct an astigmatism of less than 1 D. This hypothesis was based upon the practical sharpness of vision. It was considered that when vision is so nearly normal a slight error should give rise to no appreciable annoyance. Larger experience and more extended observations have led to quite different conclusions. We now know that an astigmatism so slight as to be scarcely appreciable by ordinary tests may be the source of very considerable discomfort when the eyes are much employed.
Since so few eyes are absolutely free from corneal astigmatism, the question
MURRELL TE. SOME OBSERVATIONS ON THE CORRECTION OF LOW DEGREES OF ASTIGMATISM.Read in the Section of Ophthalmology, at the Forty-first Annual Meeting of the American Medical Association, Nashville, Tenn., May, 1890. JAMA. 1890;XV(16):564–567. doi:10.1001/jama.1890.02410420008001b
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