Description:
Human vision, visual correction, and visual science.
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Presbyopia: Its Cause and Cure
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[...] Presbyopia: Its Cause and Cure By W. H. Bates, M.D. Presbyopia is the name given to the loss of power to use the eyes at the near point, without the aid of glasses, which usually occurs after the age of forty. The text-books teach that this change is a normal one: but it is a noteworthy fact that many other eye troubles often date from the time... more »
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Methods That Have Succeeded in Presbyopia
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[...] Methods That Have Succeeded in Presbyopia The cure of presbyopia, as of any other error of refraction, is rest, and many presbyopic patients are able to obtain this rest simply by closing the eyes. They are kept closed until the patient feels relieved, which may be in a few minutes, half an hour, or longer. Then... more »
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contrast sensitivity, visual acuity, and Photoshop
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Argh! I've been reading about "contrast sensitivity", "visual acuity", and wonder what the difference is. When I try to find this out, I am immersed in "cycles per degree". When I try to find out what that is, I get math. It's so abstract. ...Are these two things different? It seems that both are measured in... more »
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Color Correcting Lens Coatings?
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I haven't visited this ng in a few years, but... A number of years ago, I remember reading about a new development that would allow (partially?) color blind people to discriminate colors better. I believe it used thin film coatings to selectively attenuate the dominant colors, allowing for a better color balance.... more »
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Relief of Blindness at the Clinic
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[...] Stories from the Clinic 13: The Relief of Blindness By Emily C. Lierman Clinic day is always a happy day for me. It is true one sees at the hospital a great deal of suffering, sorrow and poverty; but it is a pleasure to be able to relieve some of the suffering, and sometimes things happen which are very amusing.... more »
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