Read the Snellen chart two bottom lines from 1m or 0.7m distance. Move cursor over the image and tap to open a larger image
Visual Acuity Test ; 100% contrast
Snellen Chart for iPhone
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image and tap to open a larger image
20 ft (6.1 m) is the ideal test distance for determining a person’s visual acuity as rays of light are considered to be coming from optical infinity, i.e. the rays are parallel to each other and they focus clearly on the retina; this condition is called emmetropic vision.
The visual acuity test at shorter distances could be affected by visual defects of the eye