LASIK With the Optimized Aspheric Transition Zone and Cross-cylinder Technique for the Treatment of Astigmatism From 1.00 to 4.25 Diopters
Abstract
Purpose:
The predictability and safety of LASIK with the optimized aspheric transition zone (OATz) and cross-cylinder technique were evaluated for the surgical correction of myopia with 1.00 to 4.25 diopters (D) of astigmatism.
Methods:
In this prospective study, 74 eyes of 48 consecutive LASIK patients with astigmatism ranging from 1.00 to 4.25 D were evaluated. All eyes underwent laser ablation with profile 7 of the OATz algorithm with the NIDEK CXIII excimer laser platform. Refractive outcomes, visual acuity, and patient satisfaction were assessed based on 6-month postoperative data.
Results:
Preoperative manifest refraction spherical equivalent (MRSE) was −2.10±1.19 D (range: −0.50 to −5.75 D) and mean cylinder was −1.94±0.89 D (range: −1.00 to −4.25 D). At 6 months postoperatively, the mean MRSE for all eyes was 0.01−0.37 D (range: −0.75 to −1.00 D). Postoperatively, 78.3% (58/74) of eyes achieved uncorrected visual acuity (UCVA) of 20/20 or better, and 97.3% (72/74) of eyes achieved UCVA of 20/40 or better. Regarding predictability, 94.6% (70/74) of eyes were within −0.50 D of intended MRSE and 98.6% (73/74) of eyes were within −1.00 D of intended MRSE. Four (5.3%) eyes lost two lines of best spectacle-corrected visual acuity at 6 months. Stability was reached between 1 and 3 months and verified at 6 months postoperatively.
Conclusions:
LASIK with OATz and the cross-cylinder technique is safe and predictable for the treatment of patients with astigmatism up to 4.25 D. [J Refract Surg. 2009;25:S927–S930.]
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