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  • Title: Comparison of LASIK with the OPDCAT or OATz algorithm using the NIDEK EC-5000CXII excimer laser.
    Author: Hori-Komai Y, Toda I, Yamamoto T, Tsubota K.
    Journal: J Refract Surg; 2010 Jun; 26(6):411-22. PubMed ID: 19681511.
    Abstract:
    PURPOSE: To compare refractive outcomes, higher order aberrations, visual quality, and patient satisfaction between aspheric and whole-eye wavefront aspheric LASIK algorithms. METHODS: Two hundred seventy-four eyes of 152 patients undergoing LASIK for myopia and myopic astigmatism were divided into two groups: eyes that underwent treatment using either the OPD-guided customized aspheric treatment (OPDCAT) or optimized aspheric treatment zone (OATz). Both groups were subdivided into two groups based on preoperative manifest refraction spherical equivalent (MRSE) <or= 6.00 diopters (D) and eyes with MRSE >or = - 6.00 D. Both groups were additionally subdivided into eyes with preoperative ocular higher order aberrations <0.40 microm and eyes with higher order aberrations >or = 0.40 microm. A P value <.05 was considered statistically significant. RESULTS: At 3 months postoperatively, 88.3% (242/274) of eyes were available for follow-up. Postoperatively, 91.4% of eyes in the OPDCAT group and 90.6% of eyes in the OATz group were within 0.50 D. No difference in refractive outcomes and patient satisfaction among groups or subgroups was noted (P>.05). A significantly less change in asphericity (less oblate) was noted for the OPDCAT group (0.31 +/- 0.30) compared with the OATz group (0.51 +/- 0.35) (P<.05). A lower induction of aberrations in the OPDCAT group compared with the OATz group was noted ( P<.05). Mesopic contrast sensitivity was significantly higher for the OPDCAT groups and subgroups (P<.05). CONCLUSIONS: Refractive outcomes between groups or subgroups were equivalent. A significantly lower induction of higher order aberrations and less change in asphericity in the OPDCAT group was noted. The OPDCAT algorithm was more likely to maintain mesopic contrast sensitivity.
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