Topography-guided transepithelial surface ablation reduces moderate to high astigmatism

Issue: June 2016

Topography-guided transepithelial surface ablation improved vision and reduced moderate to high astigmatism, according to a study.

The retrospective study included 206 eyes; 153 eyes had myopic astigmatism and 53 eyes had mixed astigmatism.

Topography-guided transepithelial surface ablation was performed with the iRes excimer laser (iVis Technology). Corneal Interactive Programmed Topographic Ablation software (CIPTA, iVis Technology) was used to create a custom ablation plan for each eye based on subjective refraction and corneal topography.

Postoperative uncorrected distance visual acuity was better than 20/20 in 92% of eyes in the myopic astigmatism group and 83% of eyes in the mixed astigmatism group. No eyes lost more than one line of corrected distance visual acuity.

All eyes had astigmatism of 2 D or greater preoperatively. Residual refractive astigmatism was 0.5 D or less in 82.4% of eyes in the myopic astigmatism group and 56.7% of eyes in the mixed astigmatism group. Residual refractive astigmatism was 1 D or less in 97.4% of eyes in the myopic astigmatism group and 84.9% of eyes in the mixed astigmatism group.

Spherical equivalent refraction was within 0.5 D of the target in 83.7% of eyes in the myopic astigmatism group and 79.2% of eyes in the mixed astigmatism group. It was within 1 D of the target in 99.3% of eyes in the myopic astigmatism group and 94.3% of eyes in the mixed astigmatism group. – by Matt Hasson

Disclosure: The authors report no relevant financial disclosures.

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Source:

Chen X, et al. J Refract Surg. 2016;doi:10.3928/1081597X-20160428-01.