Certified Paraoptometric Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which of the following terms represents the position of the cylinder within the lens?

Ascent

Location

Proximity

Axis

The term that represents the position of the cylinder within the lens is "axis." In optics, particularly in the context of cylindrical lenses used for correcting astigmatism, the axis indicates the orientation of the cylindrical power. It is measured in degrees and helps to define where the lens's corrective effect is focused, aligning with the steepest or flattest meridian of the cornea.

Understanding the axis is crucial for proper lens fitting, as an incorrect axis can lead to visual distortion and ineffective correction of vision. Therefore, it serves a significant function in determining how the cylindrical power should be applied in the lens.

The other options do not accurately describe the orientation of the cylinder within the lens; thus, they are not applicable in this context.

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