The optic nerve transmits electrical impulses from the retina to the brain. When examining the retina through the pupil, a portion of the optic nerve can be seen. It is known as optic disc. There are no cones and rods on this spot.
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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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