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

The Original Bates Method, for correcting vision defects

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12                          Introductory
to the theory, it ought to assume only for vision at the near-point. These curious performances may seem un natural to the lay mind; but ophthalmologists believe the tendency to indulge in them to be so ingrained in the constitution of the organ of vision that, in the fittir of glasses, it is customary to instill atropine-the "drop with which everyone who has ever visited an oculist familiar-into the eye, for the purpose of paralyzing tj ciliary muscle and thus, by preventing any change o. curvature in the lens, bringing out "latent hyperme-tropia" and getting rid of "apparent myopia."
The interference of the lens, however, is believed to account for only moderate degrees of variation in errors of refraction, and that only during the earlier years of life. For the higher ones, or those that occur after forty-five years of age, when the lens is supposed to have lost its elasticity to a greater or less degree, no plausible explanation has ever been devised. The disappearance of astigmatism,1 or changes in its character, present an even more baffling problem. Due in most cases to an unsymmetrical change in the curvature of the cornea, and resulting in failure to bring the light rays to a focus at any point, the eye is supposed to possess only a limited power of overcoming this condition; and yet astigmatism comes and goes with as much facility as do other errors of refraction. It is well known, too, that it can be pro duced voluntarily. Some persons can produce as much as three diopters. I myself can produce one and a half.
Examining 30,000 pairs of eyes a year at the New York Eye and Ear Infirmary and other institutions, I observed
1 From the Greek a, without, and stigma, a point.