Convex Lenses are thicker in the center and thinner at the edges. Light rays are converged towards a central point. These lenses are used in correction of hyperopia. These lenses are indicated with plus (+) sign on prescriptions.
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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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