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]]. | '''''20/20 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]]. | ||
If you can see 20/15 or even better, this means that you are [[overcorrected]]. (It is not necessarily considered super-human acuity, but it is unnecessary to correct to this level.) | If you can see 20/15 or even better, this means that you are [[overcorrected]]. (It is not necessarily considered super-human acuity, but it is unnecessary to correct to this level. Also, 20/15 isn't always a good measurement, as [[User:User]] can sometimes see 20/15 with Normalized, and overcorrection makes 20/10 readable on a bright Snellen) | ||
It is very difficult to perform [[Active Focus]] at this level of correction, 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 level of correction, as there is not enough of a [[blur horizon]] to produce [[stimulus]] - see [[Distance vision]]. | ||
Revision as of 23:43, 4 September 2021
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.
If you can see 20/15 or even better, this means that you are overcorrected. (It is not necessarily considered super-human acuity, but it is unnecessary to correct to this level. Also, 20/15 isn't always a good measurement, as User:User can sometimes see 20/15 with Normalized, and overcorrection makes 20/10 readable on a bright Snellen)
It is very difficult to perform Active Focus at this level of correction, as there is not enough of a blur horizon to produce stimulus - see Distance vision.