What characteristic does a toric base curve lens have?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

What characteristic does a toric base curve lens have?

Explanation:
A toric base curve lens is designed to correct astigmatism by having different curvatures in two meridians on the back surface while the front surface remains spherical. The back surface is toric, with two distinct radii of curvature, so it can neutralize the eye’s cylindrical error. Keeping the front surface spherical helps preserve overall optical power and reduces distortion, while the cylindrical correction is carried by the back surface. This is why the characteristic described is two different back surface curves with a spherical front curve.

A toric base curve lens is designed to correct astigmatism by having different curvatures in two meridians on the back surface while the front surface remains spherical. The back surface is toric, with two distinct radii of curvature, so it can neutralize the eye’s cylindrical error. Keeping the front surface spherical helps preserve overall optical power and reduces distortion, while the cylindrical correction is carried by the back surface. This is why the characteristic described is two different back surface curves with a spherical front curve.

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