[DOC] [TLE] Snellen chart - Wikipedia [PAR] A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen 
charts are named after the Dutch ophthalmologist Herman Snellen who 
developed the chart in 1862. Many ophthalmologists and vision scientists now 
use an improved chart ... Snellen developed charts using symbols based in a 55 
unit grid. [DOC] [TLE] Eye Test - The Eye Chart and 20/20 Vision Explained [PAR] Various eye charts and tests can be used to determine your visual acuity. ... 
During an eye test, eye doctors use eye charts to measure how well you see in 
the ... Since many eye doctors' offices don't have rooms that are 20 feet long, in a 
... The tumbling E chart has the same scale as a standard Snellen eye chart, but 
all... [DOC] [TLE] Visual Acuity - TedMontgomery.com [PAR] Described is what visual acuity means and how to measure the size of a 20/20 
letter. ... 20 is used in visual acuity measurements is because, in the United 
States, the standard ... A person with 20/20 vision could stand 30 feet away from 
a test chart and just decipher a ... For instance, many people have 20/15 visual 
acuity. [DOC] [TLE] Vision Screening Using the Snellen Eye Chart [PAR] During a vision screening, you will typically be asked to sit or stand 20 feet ... side 
of the chart indicate how many feet away a person with normal acuity could be... [DOC] [TLE] Visual acuity test: MedlinePlus Medical Encyclopedia [PAR] Feb 23, 2015 ... Read our article and learn more on MedlinePlus: Visual acuity test. ... You will be 
asked to remove your glasses or contact lenses and stand or sit 20 feet from the 
eye chart. ... Colenbrander A. Measuring vision and vision loss. ... to verify that 
A.D.A.M. follows rigorous standards of quality and accountability. [DOC] [TLE] How the 20/20 Vision Scale Works - Today I Found Out [PAR] Dec 31, 2013 ... So what exactly are eye doctors measuring, and how can the scale be different ... 
the average person can see standing 20 feet away from the same thing. Take the 
Snellen eye chart, which is what your eye doctor will usually ... 20/200 visual 
acuity and worse is considered legally blind in the United States. [DOC] [TLE] Vision Screening Resources - School Health [PAR] We've worked with many customers to get vision screening programs in place, 
even ... 20/30 is a Snellen visual acuity measurement fraction or notation (
Hermann ... Think about it this way: the child must stand 20 feet from an eye chart 
to ... Based on the Landolt rings, international standard, in terms of recognition 
difficulty. [DOC] [TLE] What is the difference between a 6/6, 6/9, etc., eye vision? - Quora [PAR] Feb 12, 2013 ... These numbers are measurements of visual acuity; that is, of how clear and 
accurate ... The standard test for visual acuity is very simple: you stand a certain 
... So your score would be 6/6: while standing 6 meters from the chart (first 6), ... to 
a visual acuity of 20/30 if the corresponding measures are in feet. [DOC] [TLE] Snellen Test [PAR] Print the test page in A4 standard format. Place yourself 2.8 meters (or 9 feet) 
away from the chart. If the test ... must stand facing it, using the following formula: 
measure the height of the ... Test your visual acuity with correction (contact lenses 
or glasses). 3. Test one eye at a time. Start with the right eye, covering the left one
... [DOC] [TLE] Snellen Eye Test Charts Interpretation - Precision Vision [PAR] Letter charts are not only used to measure visual acuity, they are also used as ... 
letter size: the distance in meters (feet) at which the letter subtends 5 min of arc. 
... Zero logMAR indicates standard vision; zero visual acuity indicates blindness. 
... or symbol-based chart, some authors use the termSnellen chart only for charts
... [DOC] [TLE] Printable Snellen Eye Chart - Disabled World [PAR] VA is the most common clinical measurement of visual function. A visual ... Many 
humans have one eye

Question: The standard measure of visual acuity is based on standing this many feet from an eye chart
Answer: 20