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 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]]. | '''''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. More specifically, 20/20 vision is defined as being able to differentiate details that make up 1 arc minute of your viewing angle, which equals around 0.016° of your 360° visual perception. 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]]. | ||
Revision as of 20:57, 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. More specifically, 20/20 vision is defined as being able to differentiate details that make up 1 arc minute of your viewing angle, which equals around 0.016° of your 360° visual perception. 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.