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Toric IOLs treat astigmatism more effectively than paired clear corneal incisions
J Cataract Refract Surg. 2009:35(3):451-458.
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Toric IOL implantation corrected regular corneal astigmatism slightly more effectively than paired opposite clear corneal incisions.
Toric IOLs address some drawbacks of opposite clear corneal incisions (OCCI) such as potential long-term mechanical instability and variability of refractive outcomes. New toric IOL designs are more stable than older designs, the study authors said.
“Rotation of the toric IOL after implantation is the main problem associated with this modality,” they said. “However, new toric IOL designs have been found to be quite stable (at less than 4° of rotation).”
A prospective, randomized clinical trial included 40 eyes of 40 patients. Twenty eyes underwent paired 2.75 mm/3.20 mm OCCI in the steep axis with spherical IOL implantation; 20 eyes received AcrySof toric IOLs (Alcon).
The study data showed 95% of eyes in the toric IOL group attained uncorrected visual acuity of 20/40 or better; 70% achieved UCVA of 20/25 or better. In the OCCI group, 80% of eyes achieved UCVA of 20/40 or better and 50% attained UCVA of 20/25 or better.
Mean refractive cylinder decreased from –1.75 D to –0.62 D in the toric IOL group and from –1.61 D to –0.97 D in the OCCI group.