American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO (American Board of Opticianry) Test with interactive flashcards and hundreds of multiple choice questions. Updated for 2024 to help you excel on exam day

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the tolerance for a cylinder of 1.62 diopters or greater?

+/- 1 degree
+/- 2 degrees
+/- 3 degrees
+/- 4 degrees

The correct answer is: +/- 2 degrees

For a cylinder of 1.62 diopters or greater, the tolerance for the axis is typically +/- 2 degrees. The axis refers to the orientation of the cylinder in the lens and is crucial for proper astigmatism correction. Any deviation beyond +/- 2 degrees could lead to significant visual disturbances for the patient. Therefore, maintaining precise axis alignment within this 2-degree range is essential in producing accurate and effective corrective lenses. Options A, C, and D are incorrect as they present axis tolerance values that are not typically accepted in practice for cylinders of 1.62 diopters or greater.