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

The Original Bates Method, for correcting vision defects

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82                What Glasses Do To Us
that they are made more or less color-blind by them, and in a shop one may note that they remove them when they want to match samples. If the sight is seriously defective, the color may be seen better with glasses than without them.
That glasses must injure the eye is evident from the facts given in the preceding chapter. One cannot see through them unless one produces the degree of refrac tive error which they are designed to correct. But re fractive errors, in the eye which is left to itself, are never constant. If one secures good vision by the aid of con cave, or convex, or astigmatic lenses, therefore, it means that one is maintaining constantly a degree of refractive error which otherwise would not be maintained con stantly. It is only to be expected that this should make the condition worse, and it is a matter of common expe rience that it does. After people once begin to wear glasses their strength, in most cases, has to be steadily increased in order to maintain the degree of visual acuity secured by the aid of the first pair. Persons with pres byopia who put on glasses because they cannot read fine print too often find that after they have worn them for a time they cannot, without their aid, read the larger print that was perfectly plain to them before. A person with myopia of 20/70 who puts on glasses giving him a vision of 20/20 may find that in a week's time his unaided vision has declined to 20/200, and we have the testimony of Dr. Sidler-Huguenin, of Zurich,1 that of the thousands of myopes treated by him the majority grew steadily worse, in spite of all the skill he could apply to the fit ting of glasses for them. When people break their glasses and go without them for a week or two, they