Certified Paraoptometric Practice Test

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the Certified Paraoptometric Test! Study using flashcards, multiple choice questions, and detailed explanations. Get ready for your exam and boost your optometric skills!

Practice this question and more.

What is the specific term for the placement of the cylinder within the lens?

Track
Direction
Positioning
Axis

The correct answer is: Axis

The correct term for the placement of the cylinder within the lens is "axis." In optometry, the axis refers specifically to the orientation of the cylindrical power in a lens, which is critical for correcting astigmatism. The axis is measured in degrees and describes the meridian of the lens that has no cylindrical correction, indicating the direction of the cylindrical power. Understanding the axis is essential because it directly affects how light enters the eye and is focused on the retina. The proper alignment of the cylinder’s axis ensures that the corrective properties of the lens effectively counteract the irregular curvature of the cornea or lens in a patient with astigmatism. Knowing the precise axis is necessary for ensuring visual clarity and comfort for the patient. The other options, while related to varying aspects of lens placement or orientation, do not specifically denote the aspect of cylinder orientation that is crucial in the context of astigmatism correction.