Ads
related to: free online distance vision test near melenscrafters.com has been visited by 10K+ users in the past month
1599 W Lane Ave, Columbus, OH · Directions · (614) 486-7589
The quality of the glasses was outstanding. - Bizrate
Search results
Results From The WOW.Com Content Network
In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
To measure near vision, a patient is seated in a well illuminated room is asked to read the handheld near vision chart kept at a distance of 25–35 cm away from the eye. [13] The distance used for near vision testing may vary depending on the occupation or basic need of the patient. [14] The smallest test type that the patient can read is the ...
In the expression 6/x vision, the numerator (6) is the distance in metres between the subject and the chart and the denominator (x) the distance at which a person with 6/6 acuity would discern the same optotype. Thus, 6/12 means that a person with 6/6 vision would discern the same optotype from 12 metres away (i.e. at twice the distance).
An example of the Landolt C eye chart (also known as the Japanese eye chart.). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
The chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...
You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.
Ads
related to: free online distance vision test near melenscrafters.com has been visited by 10K+ users in the past month
1599 W Lane Ave, Columbus, OH · Directions · (614) 486-7589
The quality of the glasses was outstanding. - Bizrate