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

The Original Bates Method, for correcting vision defects

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184 Adverse Conditions a Benefit to the Eyes
taken in our homes, offices and schools to temper the light, whether natural or artificial, and to insure that it shall not shine directly into the eyes; smoked and amber glasses, eye-shades, broad-brimmed hats and parasols are commonly used to protect the organs of vision from what is considered an excess of light; and when actual disease is present, it is no uncommon thing for patients to be kept for weeks, months and years in dark rooms, or with bandages over their eyes.
The evidence on which this universal fear of the light has been based is of the slightest. In the voluminous literature of the subject one finds such a lack of informa tion that in 1910 Dr. J. Herbert Parsons of the Royal Ophthalmic Hospital of London, addressing a meeting of the Ophthalmological Section of the American Med ical Association, felt justified in saying that ophthalmol ogists, if they were honest with themselves, "must con fess to a lamentable ignorance of the conditions which render bright light deleterious to the eyes."1 Since then, Verhoeff and Bell have reported2 an exhaustive series of experiments carried on at the Pathological Laboratory of the Massachusetts Charitable Eye and Ear Infirmary, which indicate that the danger of injury to the eye from light radiation as such has been "very greatly exagger ated." That brilliant sources of light sometimes produce unpleasant temporary symptoms cannot, of course, be denied; but as regards definite pathological effects, or permanent impairment of vision from exposure to light alone, Drs. Verhoeff and Bell were unable to find, either clinically or experimentally, anything of a positive na ture.
^our. Am. Med. Assn., Dec. 10, 1910, p. 2028.
"Proc. Am. Acad. Arts and Sciences. 1916, Vol. 51, No. 13.