1.Kryptok_fused bifocals lens are most popular, less expensive and dividing line isn't seen easily.
2.Executive_one piece bifocals lens are mono centric, minimal or no prismatic effect, wide field of view for reading and no chromatic aberration.
3. 'D' fused bifocals lens are minimal prismatic effect, technically the most advanced bifocals and inconspicuous dividing line and are more expensive lenses.
Saturday, 25 February 2017
Types of Bifocals lens
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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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