NOCE ABO Basic Practice Questions - National Opticianry Competency Examination (NOCE) Exam

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A patient has a prescription of -8.00 D measured at a 12 mm vertex distance. If fitted with contact lenses (0 mm vertex distance), what is the approximate effective power?

-7.25 D -7.50 D -8.00 D -8.50 D

Correct Answer:

-7.25 D

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