Toric lenses correct corneal astigmatism, helping to deliver crisp distance vision without relying on glasses. They are contraindicated in irregular corneal astigmatism, where other strategies may be more appropriate.

For the technically minded: Toric intraocular lenses have built‑in cylindrical power aligned to the steep corneal meridian, and one degree of rotational misalignment reduces cylinder effect by approximately 3.3 percent. Irregular astigmatism undermines predictable axis alignment and effective cylinder; topography and tomography guide candidacy.