Certified Paraoptometric (CPO) Practice Exam 2026

Question: 1 / 420

What does the axis of a lens refer to?

The orientation of the optical power

The axis of a lens refers specifically to the orientation of the optical power. In the context of lenses, particularly those used in prescription glasses or contact lenses, the axis indicates the direction in which the lens power is aligned. This is crucial for correcting vision in conditions like astigmatism, where the optical power is not uniform across the lens.

Understanding the axis helps in determining how the light is focused through the lens, ensuring that the optical corrections provided by the lens align properly with the visual systems of the individual. Other aspects, such as thickness, curvature, or material, while important characteristics of a lens, do not pertain to the axis in terms of optical correction.

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The thickness of the lens

The curvature of the lens

The material of the lens

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