ABO NOCE Basic Opticianry

Category - Ophthalmic Products

Which is not a requirement of a basic safety lenses according to ANSI standards?
  1. Have a minimum center thickness of 3
  2. Pass a drop ball test of a 1 inch diameter steel ball dropped 50 inches
  3. Use the materials of either polycarb, Trivex or SR-91
  4. Have a minimum edge thickness of 2.5 mm if the prescription is +3.00 or higher
Explanation
Answer: C - Using the materials of either polycarb, Trivex or SR-91 is not a requirement for basic safety lenses by ANSI.

A basic safety lens has different requirements than a safety high impact lens must have. However the safety high impact does require the use of the either polycarb, Trivex or SR-91.
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