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Toric Lenses Practice Test

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A toric lens has markings at 3 o'clock and 9 o'clock. Which axis orientation should be used to assess rotation?
Correct Answer:
Horizontal
Explanation:
Toric lenses are oriented along a specific axis, and the tiny marks show that axis. When the marks sit at 3 o’clock and 9 o’clock, they lie on a horizontal line. To check rotation, you compare where that horizontal line is on the eye to where it should be. If the lens has rotated, the line formed by the markings will tilt away from horizontal. So the horizontal axis is the natural reference to use for assessing rotation because the marks themselves define that orientation. Using vertical or diagonal would not align with where the marks actually sit, and ignoring the marks wouldn’t reveal rotation.

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