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

The Original Bates Method, for correcting vision defects

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A VERY common phenomenon of imperfect sight is the one known to medical science as "muscae volitantes" or "flying flies." These floating specks are usually dark or black, but sometimes appear like white bubbles, and in rare cases may assume all the colors of the rainbow. They move somewhat rapidly, usually in curving lines, before the eyes, and always ap pear to be just beyond the point of fixation. If one tries to look at them directly, they seem to move a little far ther away. Hence their name of "flying flies."
The literature of the subject is full of speculations as to the origin of these appearances. Some have at tributed them to the presence of floating specks-dead cells or the debris of cells-in the vitreous humor, the transparent substance that fills four-fifths of the eyeball behind the crystalline lens. Similar specks on the sur face of the cornea have also been held responsible for th em. It has even been surmised that they might be caused by the passage of tears over the cornea. They are so common in myopia that they have been supposed to be one of the symptoms of this condition, although they occur also with other errors of refraction, as well as in eyes otherwise normal. They have been attributed to disturbances of the circulation, the digestion and the kidneys, and because so many insane people have them, have been thought to be an evidence of incipient in sanity. The patent-medicine business has thrived upon