Toric Lenses Practice Test

Toric contact lenses tend to move _________ degrees with blinking.

5-10 10-20 0-5 15-20

Correct Answer:

5-10

Explanation:

Toric lenses are designed to correct astigmatism by aligning their axis with the eye, but that axis isn’t rigidly fixed during blinking. The eyelids apply a gentle torque as they blink, causing the lens to rotate a small amount. This blink-induced rotation is typically in the five-to-ten-degree range. It’s normal for the lens to move a bit with each blink and then settle back to its proper axis afterward. If rotation were much larger, vision would be unstable and might indicate a need for a different lens design or a re-fit. Therefore, five to ten degrees best describes the usual movement.

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