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

The Original Bates Method, for correcting vision defects

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Voluntary Increase
of Refractive Error 91
Fig. 35 Myopia Produced by unconscious Strain to See at the Distance is Increased by Conscious Strain.
No. 1.-Normal vision.
No. 2.-Same subject four years later with myopia. Note the strained expression.
No. 3.-Myopia increased by conscious effort to see a distant object.