April 4, 1922, the vision of Miss V. M. B., aged 25, a student at Rush Medical College, was 20/20 + in each eye, with and without a very slight correction for compound hypermetropic astigmatism, fitted after careful refraction with homatropine. The appearance of the eyes was perfectly normal externally and internally. Muscle balance was normal. In May 1927 a slight change of the glasses was necessary. With these her vision was 20/15, and her near point from 18 to 20 cm. Again no changes were found in the interior of the eyes. March 22, 1935, at the age of 38 years, she complained of clouding of the vision, which had seemed to come on rather suddenly about three weeks before. Accommodation was slightly reduced, but there was no essential change in the refraction or in the central fields of vision. When the pupils were widely dilated there was
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T. D. Allen (1935) studied this question.