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ABO NOCE Basic Opticianry

Category - Laws, Regulations, and Standards

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What is the ANSI add tolerance for a lens with less than a 4 add?

0.12 D (+/-)
0.25 D (+/-)
0.18 D (+/-)

Explanation

Answer: A - The ANSI standard for add tolerance for lenses with less than a 4 add is 0.12 D (+/-).

All add powers less than 4 have the same tolerance. Lenses with adds higher than 4 have an ANSI standard tolerance of 0.18 D (+/-).

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