The perfection attained in modern operative methods warrants the assertion that with reasonable self-control on the part of the patient and thorough aseptic precautions both during the operation and after the treatment, the results of correctly performed extractions of mature, uncomplicated, senile cataract should be fairly uniform, and the patient's vision should very nearly approximate 20/20.
To the astigmatism, which so frequently results from cataract extraction, is often due our failure to obtain this perfect result. If the degree is high, even though it be regular, it is sometimes impossible by means of any glass to correct it in such a manner as to obtain full vision and, even where central vision of 20/20 is obtained by the aid of strong cylindrical lenses, such lenses are well known to have some serious disadvantages in general use, not the least of which is the necessity for great care in keeping them
CLARK CF. ASTIGMATISM AFTER CATARACT EXTRACTION. JAMA. 1899;XXXIII(23):1387–1391. doi:10.1001/jama.1899.92450750007001d
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