Difference between revisions of Distance vision
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Dlskidmore (talk | contribs) (new page) |
(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 0.2D, 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 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. |