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jkevn
sage
Reged: 03/02/06
Posts: 211
Loc: Tucson, Arizona
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off-axis binoculars performance
10/04/09 10:48 PM
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I was wondering how subjective the evaluation of off-axis performance is in different binoculars, mostly curvature of field, depending on the person's age and degree of prebyopia. I think that a young person may be able to accomodate, to some extent, for a change in focus from center to the outer edges of the field of view. Not for astigmatism or coma, of course. but the eye automically compensates for a change in focus, if it can. After the age of 40, almost everyone begins to lose the ability to change their eye's focus. In my case, at age 55, I've had cataract surgery in both eyes to remove cataracts and implant acrylic lens replacements, and although I have now near 20/20 distance vision without glasses (a lot better than before), I have zero ability to change focus. So what I see might be a good measure of how flat the field really is...just a thought.
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