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

The Original Bates Method, for correcting vision defects

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Should Have Been Impossible            97
No. 1.-The patient is reading the Snellen test card at twenty feet with normal vision. No. 2.-She is straining to see the test card at the same distance, and her hypermetropia is lessened by two diopters so that her glass now overcorrects it and she cannot see the card perfectly. No. 3.-With a convex reading glass of thirteen diopters the right eye is focussed accurately at thirteen inches. No. 4.-The patient is straining to see at the same dis tance and her hypermetropia is so increased that in order to read she would require a glass of fifteen diopters. On the basis of the accepted theory that the power of accommodation is wholly destroyed by the removal of the lens these changes in the refraction would have been impossible. The experiment was repeated several times and it was found that the error of refrac tion produced by straining to see varied, being sometimes more and sometimes less than two diopters.