Accuracy of astigmatism correction with toric intraocular lens implantation in eyes with previous radial keratotomy.

PURPOSE: To evaluate refractive outcomes of toric intraocular lens (IOL) implantation in eyes with previous radial keratotomy (RK).

SETTING

Cullen Eye Institute, Baylor College of Medicine, Houston, Texas.

DESIGN

Retrospective case series.

METHODS

Consecutive cases with previous RK and had undergone cataract surgery with toric IOL implantation and met the following criteria were retrospectively reviewed: (1) regular bowtie corneal astigmatism within the central 3.0 mm zone, (2) difference in corneal regular astigmatism magnitude between the IOLMaster and Lenstar of ≤ 0.75 diopters (D), (3) difference in the regular astigmatism meridians from the 2 biometers of ≤15 degrees, and (4) available postoperative manifest refraction at ≥ 8 weeks with corrected distance visual acuity of 20/30 or better. Vector analysis was used to assess the preoperative corneal and postoperative refractive astigmatism.

RESULTS

In 40 eyes of 31 patients with previous RK, preoperatively, the mean magnitude of corneal regular astigmatism was 2.10 ± 0.98 D; 1 (3%) and 2 (10%) eyes had anterior corneal regular astigmatism ≤0.5 D and ≤1.0 D, respectively; and the centroid value was 1.14 D @ 179 degrees ± 2.05 D. Postoperatively, the mean magnitude of refractive regular astigmatism was 0.46 ± 0.44 D; 29 (73%) and 35 (88%) of eyes had refractive regular astigmatism ≤0.5 D and ≤1.0 D, respectively (P < .05); and the centroid value was 0.12 D @ 173 degrees ± 0.63 D (P < .05).

CONCLUSIONS

Toric IOLs can be used successfully to treat corneal regular astigmatism in eyes with previous RK.