Certified Paraoptometric (CPO) Practice Exam

Question: 1 / 400

What do we call the position of the cylinder within the lens?

Radius

Extension

Alignment

Axis

The position of the cylinder within the lens is referred to as the axis. In optometry, the axis is an important measurement that indicates the orientation of the cylindrical component of a lens, which is essential for correctly correcting astigmatism. The axis is measured in degrees, ranging from 1 to 180, and it describes the direction along which the lens is most effective at correcting the refractive error.

Understanding the axis is crucial because it helps ensure that the lens is aligned properly with the visual system of the patient. If the axis is not accurately determined and marked, it can lead to visual discomfort and blurred vision, as the cylinder may not effectively compensate for the irregular curvature of the cornea or lens. This precise orientation of the cylinder allows for optimal vision correction, enabling patients to see clearly.

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