Ceratectomia fotorrefrativa para correção de miopia moderada com excimer lasers VISX e Summit: estudo retrospectivo

Purpose: To present photorefractive keratectomy (PRK) results for myopia ranging from -4,00 to - 6,00 diopters performed with the VISX and Summit excimer lasers. Methods: To be eligible for this study, patients had to be 20 to 45 years of age, have -4.00 to -6.00 diopters of myopia and have no more than 1 D of astigmatism. The Summit group was composed of 51 eyes. The baseline preoperative spherical equivalent of myopia was -5.22 ± 0.17 and surgeries were performed with the Excimed UV 200 LA Excimer Laser. In the VISX group, there were 53 eyes and the baseline refractive error was -4.85 ± 0.16 and surgeries were performed with the Twenty/Twenty Excimer Laser. Results: At six-month examination, haze ranged from 0 to 1 (M:0.56 ± 0.07) in the VISX group and from 0 to 3 (M:0.58 ± 0.08) in the Summit group. Uncorrected vision at six months was 20/20 or better in 22% of eyes and 20/40 or better in 83% of eyes in the VISX group. In the Summit group, 25% of eyes were 20/20 or better and 71% were 20/40 or better at the six-month examination. Conclusion: It is reassuring that PRK of patients with -4.00 to -6.00 D of myopia results in acceptable results. Objetivo: Apresentar os resultados obtidos com ceratecto-mia fotorrefrativa (PRK) para a correção de miopia variando de -4,0 a -6,0 dioptrias realizadas com os excimer lasers VISX e Summit. Métodos: Para o estudo foram avaliados os resultados de PRK realizadas em pacientes com idade entre 20 e 45 anos, miopia entre -4,0 e -6,0 dioptrias e astigmatismo até 1,0 dioptria. O grupo operado com o laser da marca Summit era composto de 51 olhos. O equivalente esférico médio pré-operatório era de -5,22 ± 0,17 dioptrias e as cirurgias foram realizadas com o Excimed UV 200 LA Excimer Laser. O grupo operado com o laser VISX, era composto de 53 olhos e o erro refrativo preoperatório era de -4,85 ± 0,16 diop-trias e as cirurgias foram realizadas com o Twenty/Twenty Excimer Laser. Resultados: Exame seis meses após a cirurgia revelou "haze" variando de 0 a 1 (M:0,56 ± 0,07) no grupo VISX e variando de 0 a 3 (M:0,58 ± 0,08) no grupo Summit. Neste mesmo exa-me, acuidade visual sem correção era de 20/20 ou melhor em 22% dos olhos e 20/40 ou melhor em 83% dos olhos no grupo VISX. No grupo Summit, 25% dos olhos tinham visão melhor ou igual a 20/20 e 71% melhor ou igual a 20/40. Conclusão: Ceratectomia fotorrefrativa realizadas em olhos com miopia variando de --4,0 a ¾6,0 dioptrias apresenta re-sultados aceitáveis.