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

The Original Bates Method, for correcting vision defects

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92 Cause and Cure of Errors of Refraction
Fig. 36. Immediate Produc tion of Myopia and Myopic Astigmatism in Eyes Pre viously Normal by Strain to See at the Distance
Boy reading the Snellen test card with normal vision. Note the absence of facial strain.
The same boy trying to see a picture at twenty feet. The effort, manifested by staring, produces compound myopic astigmatism, as re vealed by the retinoscope.