Which finding suggests that a toric lens may be more appropriate than a spherical lens?

• A. Irregular corneal astigmatism
• B. Regular corneal astigmatism
• C. No astigmatism
• D. Hyperopia only

Answer: (A)

Toric lenses provide different optical powers in two principal meridians, which is what corrects astigmatism. When the corneal surface is irregularly curved, the refractive error isn’t the same in every direction, so a spherical lens can’t compensate for that uneven curvature. A toric design, with its cylindrical component, helps neutralize the astigmatic error across the varying meridians and typically yields sharper vision than a spherical lens in this situation. So, finding irregular corneal astigmatism points toward using a toric lens rather than a spherical one. If there were only regular astigmatism, a toric lens would still be suitable, but the clear cue here is the irregularity. No astigmatism or hyperopia alone wouldn’t indicate toric correction.