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1.
Arq Bras Oftalmol ; 72(4): 519-25, 2009.
Article in Portuguese | MEDLINE | ID: mdl-19820793

ABSTRACT

PURPOSE: To compare the visual and clinical outcomes of Wavefront-guided laser in situ keratomileusis (Lasik) with Alcon CustomCornea and Zyoptix systems. METHODS: A prospective, randomized, masked and bilateral study was conducted. Fifty patients with preoperative spherical equivalent ranging from -1.00 to -6.50 D were enrolled for customized ablation in both eyes. All of them were submitted to Lasik CustomCornea treatment in one eye and Zyoptix in the other eye. Uncorrected visual acuity, best correct visual acuity (BCVA), manifest refraction, wavefront measurements, and contrast sensitivity testing were performed preoperatively and postoperatively at 1, 3 and 6 months. RESULTS: Preoperatively manifest refractive spherical equivalent was -3.29+/-1.56 D in the CustomCornea group and -3.22+/-1.50 D in the Zyoptix group. At 6 months, 86% of CustomCornea eyes and 70% of Zyoptix eyes had UCVA>or=20/20. One hundred percent of the CustomCornea group and 88% of the eyes in the Zyoptix were within 0.50 D of emmetropia. In both groups, the contrast sensitivity improved. Spherical aberration increased in both groups, with the CustomCornea group showing lower levels (p<0.001). CONCLUSION: There were no differences between the systems according to safety and effectiveness. The Zyoptix platform showed greater spherical aberration.


Subject(s)
Keratomileusis, Laser In Situ/methods , Myopia/surgery , Visual Acuity , Adult , Humans , Prospective Studies , Severity of Illness Index , Treatment Outcome , Young Adult
2.
Arq. bras. oftalmol ; 72(4): 519-525, July-Aug. 2009. graf, tab
Article in Portuguese | LILACS | ID: lil-528019

ABSTRACT

OBJETIVO: Comparar os resultados obtidos após o Lasik personalizado utilizando duas plataformas diferentes. MÉTODOS: Estudo prospectivo, randomizado com 50 pacientes míopes submetidos a cirurgia refrativa em ambos os olhos. Foram selecionados para o estudo, pacientes com equivalente esférico semelhante entre os olhos. Todos foram submetidos a Lasik bilateral e simultâneo, sendo que um olho foi operado pela plataforma CustomCornea® e o outro pela Zyoptix®. Acuidade visual sem e com correção, refração dinâmica e estática, medida das aberrações oculares, teste de sensibilidade ao contraste foram realizados no período pré-operatório e pós-operatório de 1, 3 e 6 meses. RESULTADOS: No período pré-operatório a média do equivalente esférico era de -3,29 ± 1,56 D no grupo CustomCornea® e de -3,22 ± 1,50 D no Zyoptix® (p=0,267). No sexto mês de pós-operatório, a média do equivalente esférico no grupo CustomCornea® era de -0,077 ± 0,23 D e -0,282 ± 0,30 D no Zyoptix® (p<0,001*). Acuidade visual sem correção > 20/20 foi alcançada em 86 por cento dos olhos no grupo CustomCornea® e 70 por cento no grupo Zyoptix® (p=0,094). Nenhum paciente perdeu duas ou mais linhas da melhor acuidade visual corrigida. Cem por cento dos olhos CustomCornea® e 88 por cento dos Zyoptix® ficaram entre ± 0,50 D da emetropia (p=0,014*). Melhora da sensibilidade ao contraste em todas as frequências espaciais testadas foi observada em ambos os grupos. A aberração esférica apresentou aumento em ambos os grupos, porém este foi estatisticamente maior na plataforma Zyoptix® (p<0,001). CONCLUSÃO: Não foram observadas diferenças entre os grupos quanto à eficácia e segurança. O tratamento com a plataforma Zyoptix® consumiu menor quantidade de estroma. Melhor previsibilidade da correção cirúrgica foi obtida pelo grupo CustomCornea®, bem como menor indução de aberração esférica.


PURPOSE: To compare the visual and clinical outcomes of Wavefront-guided laser in situ keratomileusis (Lasik) with Alcon CustomCornea® and Zyoptix® systems. METHODS: A prospective, randomized, masked and bilateral study was conducted. Fifty patients with preoperative spherical equivalent ranging from -1.00 to -6.50 D were enrolled for customized ablation in both eyes. All of them were submitted to Lasik CustomCornea® treatment in one eye and Zyoptix® in the other eye. Uncorrected visual acuity, best correct visual acuity (BCVA), manifest refraction, wavefront measurements, and contrast sensitivity testing were performed preoperatively and postoperatively at 1, 3 and 6 months. RESULTS: Preoperatively manifest refractive spherical equivalent was -3.29 ± 1.56 D in the CustomCornea® group and -3.22 ± 1.50 D in the Zyoptix® group. At 6 months, 86 percent of CustomCornea® eyes and 70 percent of Zyoptix® eyes had UCVA > 20/20. One hundred percent of the CustomCornea® group and 88 percent of the eyes in the Zyoptix® were within 0.50 D of emmetropia. In both groups, the contrast sensitivity improved. Spherical aberration increased in both groups, with the CustomCornea® group showing lower levels (p<0,001). CONCLUSION: There were no differences between the systems according to safety and effectiveness. The Zyoptix® platform showed greater spherical aberration.


Subject(s)
Adult , Humans , Young Adult , Keratomileusis, Laser In Situ/methods , Myopia/surgery , Visual Acuity , Prospective Studies , Severity of Illness Index , Treatment Outcome , Young Adult
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