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 exam with confidence. Our comprehensive resources, including quizzes and study materials, will help you master essential opticianry concepts and pass the American Board of Opticianry exam with ease. Get started today!

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.