High index lenses polymers with an index higher than 1.58. High index lenses require flatter curve than their low index lens materials, resulting in thinner and lighter lenses. High index material tends to have a lower abbe value which results in chromatic aberration. AR Coating are usually recommended for high index lenses to eliminate these reflections.
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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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