Difference between revisions of Distance vision
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. |
m D -> Diopters |
||
| Line 1: | Line 1: | ||
'''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 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. | ||