American Board of Opticianry (ABO) Practice Test

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Which type of prescription has opposite sign conventions?

Hypermetropic Rx
Myopic Rx
Antimetropic Rx
Astigmatic Rx

The correct answer is: Antimetropic Rx

Prescriptions for hypermetropia and myopia have the same sign conventions, indicating whether the patient needs lenses to correct for farsightedness or nearsightedness. An antimetropic prescription, on the other hand, has opposite sign conventions and is used to correct for astigmatism, a condition where the eye has an irregular curvature causing blurred vision. An astigmatic prescription, while addressing a different issue, still follows the same sign conventions as hypermetropic and myopic prescriptions. Therefore, the correct answer is C Antimetropic Rx.