Difference between revisions of 20/20 correction
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'''''20/20 correction''''' is a correction you normally get from a licensed optician, which corrects your eyesight | '''''20/20 correction''''' is a correction you normally get from a licensed optician, which corrects your eyesight up to a degree of [[visual acuity]] that an [[emmetropic]] (or "normal-seeing") person achieves on a [[Snellen Chart]]. "20" refers to the distance (in ft) to the standardized Snellen Chart. So if you have 20/20 vision, you can see normally. If you can see 20/15 or even better, this means that your are [[overcorrected]]. | ||
It is very difficult to perform [[Active Focus]] at this strength of glasses, as there is not enough of a [[blur horizon]] to produce [[stimulus]] - see [[Distance vision]]. | It is very difficult to perform [[Active Focus]] at this strength of glasses, as there is not enough of a [[blur horizon]] to produce [[stimulus]] - see [[Distance vision]]. | ||
==See also== | ==See also== | ||
[[20/x vision]] | [[20/x vision]] | ||
Revision as of 20:41, 8 June 2020
20/20 correction is a correction you normally get from a licensed optician, which corrects your eyesight up to a degree of visual acuity that an emmetropic (or "normal-seeing") person achieves on a Snellen Chart. "20" refers to the distance (in ft) to the standardized Snellen Chart. So if you have 20/20 vision, you can see normally. If you can see 20/15 or even better, this means that your are overcorrected.
It is very difficult to perform Active Focus at this strength of glasses, as there is not enough of a blur horizon to produce stimulus - see Distance vision.