Difference between revisions of Visual acuity
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Viceroy Sam (talk | contribs) (Visual acuity simulator) |
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==Reading a Snellen chart== | ==Reading a Snellen chart== | ||
{{main|Snellen chart}} | {{main|Snellen chart}} | ||
* | * 20/200 would be very bad (possibly just [[myopic]]), | ||
* 20/20 is (by definition) normal, and | * 20/20 is (by definition) normal, and | ||
* | * 20/10 is excellent. | ||
Visual acuity for [[myopes]] is typically measured at [[distance vision|20 feet or 6 meters]]. Lens or mirror tricks may be used to change the effective test distance in a smaller room. Visual acuity for [[hyperopes]] is typically measured at 36cm, and a [[presbyope]] would be measured at both distances. | Visual acuity for [[myopes]] is typically measured at [[distance vision|20 feet or 6 meters]]. Lens or mirror tricks may be used to change the effective test distance in a smaller room. Visual acuity for [[hyperopes]] is typically measured at 36cm, and a [[presbyope]] would be measured at both distances. | ||