Vision graph is kept at 6 meters on the grounds that more often than not 6 meters is thought to be sufficiently close to optical infinity.The beams of light from a separation question are for all intents and purposes parallel and little settlement is required.
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Advantages: The chart is familiar Inexpensive, quick and easy to use and interpret Disadvantages: Snellen chart has only one 6/60 lette...
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Preferences: Similarly quantities of letters per line. Consistently separating amongst lines and letters. Uniform movement ...
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