The Cure of Imperfect Sight by Treatment
Without Glasses - online book

The Original Bates Method, for correcting vision defects

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34 Accepted Theory of Accommodation
Davis doubted the truth of his statements, never having seen such a case before, but found them, upon investiga tion, to be quite correct. With his lensless eye and a convex glass of eleven and a half diopters, the patient read the ten line on the test card at twenty feet, and with the same glass, and without any change in its posi tion, he read fine print at from fourteen to eighteen inches. Dr. Davis then presented the case to the Oph-thalmological Society but, as has been stated, he ob tained no light from that source. Four months later, February 4, 1895, the patient still read 20/10 at the dis tance and his range at the near point had increased so that he read diamond type at from eight to twenty-two and a half inches. Dr. Davis subjected him to numerous tests, and though unable to find any explanation for his strange performances, he made some interesting obser vations. The results of the tests by which Donders satisfied himself that the lensless eye possessed no ac commodative power were quite different from those re ported by the Dutch authority, and Dr. Davis therefore concluded that these tests were "wholly inadequate to decide the question at issue." During accommodation the ophthalmometer1 showed that the corneal curvature was changed and that the cornea moved forward a little. Under scopolamine, a drug sometimes used instead of atropine to paralyze the ciliary muscle (1/10 per cent solution every five minutes for thirty-five minutes, fol lowed by a wait of half an hour), these changes took place as before; they also took place when the lids were held up. With the possible influence of lid pressure and of the ciliary muscle eliminated, therefore, Dr. Davis felt himself bound to conclude that the changes "must
1 An instrument for measuring the curvature of the cornea.