Artigo
Calculation of Intralocular Lens Power Using Orbscan II Quantitative Area Topography After Corneal Refractive Surgery
Fecha
2009-12-01Registro en:
Journal of Refractive Surgery. Thorofare: Slack Inc, v. 25, n. 12, p. 1061-1074, 2009.
1081-597X
10.3928/1081597X-20091117-05
WOS:000272720100005
Autor
Arce, Carlos G. [UNIFESP]
Soriano, Eduardo S. [UNIFESP]
Weisenthal, Robert W.
Hamilton, Stephen M.
Rocha, Karolinne M. [UNIFESP]
Alzamora, Juan B. [UNIFESP]
Maidana, Eduardo J. [UNIFESP]
Vadrevu, Vijayalakshmi L.
Himmel, Kenneth
Schor, Paulo [UNIFESP]
Campos, Mauro [UNIFESP]
Institución
Resumen
PURPOSE: To present the prospective application of the Orbscan II central 2-mm total-mean corneal power obtained by quantitative area topography in intraocular lens (IOL) calculation after refractive surgery.METHODS: Calculated and achieved refraction and the difference between them were studied in 77 eyes of 61 patients with previous radial keratotomy (RK), RK and additional surgeries, myopic LASIK, myopic photo-refractive keratectomy (PRK), or hyperopic LASIK who underwent phacoemulsification without complications in 3 eye centers. All IOL calculations used the average from the central 2-mm Orbscan II total-mean power of maps centered on the pupil without the use of previous refractive data. Six IOL styles implanted within the bag were used.RESULTS: Using the SRK-T formula, the overall calculated refraction was -0.64 +/- 0.93 diopters (D). the overall achieved spherical equivalent refraction (-0.52 +/- 0.79 D; range: -3.12 to 1.25 D; 95% confidence interval [Cl]: -0.70/-0.34 D) was +/- 0.50 D in 53% of eyes, +/- 1.00 D in 78% of eyes and +/- 2.00 D in 99% of eyes the over-all difference between the calculated and achieved refraction (0.12 +/- 0.93 D, P=.27; range: -2.18 to 2.62 D; 95% Cl: 0.09/0.33 D) was +/- 0.50 D in 39% of eyes, +/- 1.00 D in 77% of eyes, and +/- 2.00 D in 96% of eyes. This difference was +/- 1.00 D in 77% of eyes with RK (P=.70), 82% of eyes with myopic LASIK (P=.34) and, 90% of eyes with myopic PRK (P=.96). in eyes with RK followed by LASIK, a trend toward undercorrection was noted (P=.03). in eyes with hyperopic LASIK, a trend toward overcorrection was noted (P=.005).CONCLUSIONS: in eyes with previous corneal refractive surgery, IOL power calculation can be performed with reasonable accuracy using the Orbscan II central 2-mm total-mean power. This method had better outcomes in eyes with previous RK, myopic LASIK, and myopic PRK than in eyes with hyperopic LASIK or RK with LASIK [J Refract Surg. 2009;25:1061-1074.] doi: 10.3928/1081597X-20091117-05
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