Difference between revisions of Snellen chart
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clarified wording about the refraction process
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A '''Snellen chart''' is a standard method of measuring [[visual acuity]]. A chart is rated for the distance it should be viewed at, and the lowest line that can be read has a visual acuity result number next to it. The standard distance for Snellen charts is 20 feet or 6 meters. Smaller versions are available for use in smaller indoor spaces. Generally, the [[20/20]] line is | A '''Snellen chart''' is a standard method of measuring [[visual acuity]]. A chart is rated for the distance it should be viewed at, and the lowest line that can be read has a visual acuity result number next to it. The standard distance for Snellen charts is 20 feet or 6 meters. Smaller versions are available for use in smaller indoor spaces. Generally, most myopes can be corrected to the [[20/20]] line unless they have visual acuity problems other than myopia. There is no direct correlation between visual acuity and [[myopia]]. The Snellen chart is the most commonly used way of testing if someone has sufficient corrected visual acuity to drive legally. Your [[optometrist]] will use the Snellen chart as a reference, to see what refraction will allow you to read the lowest on the chart. | ||
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==Definition of the numbers== | ==Definition of the numbers== |