American Board of Opticianry (ABO) Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the ABO certification with our comprehensive test preparation resources. Engage with interactive quizzes and detailed questions created specifically for the ABO exam. Enhance your understanding of opticianry concepts and ace your certification test!

Practice this question and more.

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.