Toric Lenses Practice Test

A patient with refractive astigmatism equal to or greater than ______ D should be considered for a toric lens?

0.50 D 0.75 D 1.00 D 1.25 D

Correct Answer:

0.75 D

Explanation:

When a toric lens is used, the goal is to correct astigmatism at the time of cataract surgery by placing a cylindrical correction along the eye’s meridians. The commonly accepted threshold for considering a toric IOL is refractive astigmatism of 0.75 diopters or greater. At or above this level, removing the astigmatic error with a toric lens can meaningfully improve uncorrected vision after surgery. Below 0.75 D, the benefit tends to be small relative to the added cost, potential rotation risk, and the precision required for alignment. Therefore 0.75 D represents the practical cutoff for considering a toric lens.

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