These lenses are used for correcting presbyopia but they don't have visible dividing line between the distance and near portion.
Instead they have a graduated section in which the power of the lens progresses smoothly from one distance to near, allowing the wearer to see clearly at all distances.
Sunday, 12 February 2017
Progressive Lenses
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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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