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Visual Acuity of the Human Eye ... The eye has a visual acuity threshold below which an object will go undetected. This threshold varies from person to person, but as an example, the case of a person with normal 20/20 vision can be considered.
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www.ndt-ed.org/EducationResources/CommunityCollege/Pene...
www.ndt-ed.org/EducationResources/CommunityCollege/PenetrantTest/Introduction/visualacuity.htm
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Visual acuity is expressed as a fraction. The top number refers to the distance you stand from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could read the same line you correctly read.
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www.nlm.nih.gov/medlineplus/ency/article/003396.htm
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If you looked at the demonstrations associated with the main diagram then you will already have been introduced to some of the factors that govern visual acuity. It will not hurt to repeat some of these and to expand on these ideas.
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www.yorku.ca/eye/acuity.htm
www.yorku.ca/eye/acuity.htm
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20/20 or 6/6 visual acuity ... near visual acuity ... Visual acuity often is referred to as “Snellen” acuity. The chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834–1908) who created them as a test of visual acuity.
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www.tedmontgomery.com/the_eye/acuity.html
www.tedmontgomery.com/the_eye/acuity.html
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Testing Visual Acuity :- ... Visual acuity charts - ... The ability to distinguish between two close points is called as visual acuity.
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members.tripod.com/manisha_b/Eye_Exams/Visual_Acuity_Ch...
members.tripod.com/manisha_b/Eye_Exams/Visual_Acuity_Charts.htm
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This is the same chart that your doctor uses to determine your visual acuity. The normal height for the letter A is 88 mm, and the viewing distance is 6 meters. ... For information on using the chart to determine your visual acuity, see "How Visual Acuity Is Measured" in the MD Support Library...
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www.mdsupport.org/snellen.html
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A standard eye chart is necessary to make comparisons and to record people's visual acuity. The most common chart used in most doctors' offices is the Snellen eye chart. In 1862, a Dutch Ophthalmologist, Dr. Hermann Snellen, devised this eye chart.
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www.mdsupport.org/library/acuity.html
www.mdsupport.org/library/acuity.html
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Measure the above line ... Measure the distance between the monitor and the person to be tested ... Fill in the required information and press "Display"
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www.smbs.buffalo.edu/oph/ped/IVAC/IVAC.html
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