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Difference between revisions of Distance vision
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(reworded the first paragraph. I was a bit confused about what it was trying to say. I hope I haven't lost some detail that I hadn't picked up on.) |
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'''Distance vision''' is, for practical purposes, anything over 6 meters or 20 feet. Because the difference in lens power from 6m to infinity is less than 0. | '''Distance vision''' is, for practical purposes, anything over 6 meters or 20 feet. Because the difference in lens power from 6m to infinity is less than 0.2 [[Diopters]], the limiting factor is less about ability to focus than simply the resolution of the retina (the number of the [[rods and cones]] in the back of your eye). | ||
As far as the [[ciliary muscle]] is concerned, your edge of blur is distance vision, no matter what the absolute distance, but you will have [[convergence]] at a near vision angle when looking at edge of blur through [[differentials]]. This is a possible mechanism of action for improvement, when the visual cortex notices the discrepancy between focus and convergence. | As far as the [[ciliary muscle]] is concerned, your [[Blur Horizon|edge of blur]] is distance vision, no matter what the absolute distance, but you will have [[convergence]] at a near vision angle when looking at edge of blur through [[differentials]]. This is a possible mechanism of action for improvement, when the [[visual cortex]] notices the discrepancy between focus and [[convergence]]. | ||
In the | In the reduced lens method, [[reduced distance glasses]] are used for outdoor work, for reading street signs, for looking out windows, and other distance vision tasks. | ||
=See Also= | =See Also= | ||
[[20-20-20 Rule]] | * [[3 hour rule]] | ||
* [[20-20-20 Rule]] | |||
* [[Close-up]] | |||
[[Category:Articles]] | |||