Summit Apex Plus versus Aesculap-Meditec Mel 70 in the treatment of myopia and astigmatism

ABSTRACT

PURPOSE: To compare the visual result in consecutive case series between two different excimer laser equipments in LASIK for myopia and astigmatism. METHODS: We analyzed the results of lasik of 11 eyes of 11 patients with myopia ranging from -0.50 to -11.25 and astigmatism from -0.50 to -4.25 who were submitted to Summit Apex Plus and 11 eyes of 11 patients with myopia ranging from -0.50 to -8.75 and astigmatism from -0.50 to -4.75 submitted to Meditec-Aesculap Mel 70.The follow-up was 1, 3 and 12 months. RESULTS: Preoperatively the mean spherical equivalent was -4.75 for Summit and -4.8 for Mel 70. At 1, 3 and 12 months after surgery, the residual error for the Summit group was 0.54; 0.58 and 0.014 and for the Mel 70 group it was 0.02; 0.04 and -0.43. There were no statistically significant differences between two excimer laser equipments regarding: spherical equivalent (SE), uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA) pre- and postoperatively. One year after surgery 90.9% presented BCVA =20/20 for Summit and 73% for Mel 70, 81.8% had UCVA =20/20 for Summit and 45.5% for Mel 70. The final mean postoperative SE was 73% within ±1.00 D for Summit and 82% within ±1,00 D for Mel 70. Loss of one or two lines BCVA was 9% for Summit and 27.3% for Mel 70. Complications: 9% cases of diffuse lamellar keratitis and 45.5% of epithelial ingrowth for Mel 70. DISCUSSION: Both Summit Apex Plus and Meditec-Aesculap Mel 70 were found to be similar, safe and efficient for the correction of myopia and astigmatism.

Keywords: Myopia; Astigmatism; Keratomileusis, laser in situ; Comparative study

RESUMO

OBJETIVO: Comparar o resultado visual de uma série de casos de LASIK para correção de miopia e astigmatismo utilizando dois aparelhos de excimer laser de diferentes fabricantes. MÉTODOS: Foram estudados 22 olhos de 11 pacientes com miopia de -0,50 a -11,25 e astigmatismo de -0,50 a -4,75 no período de março de 2000 a julho de 2001. Os pacientes realizaram LASIK num olho com o excimer laser da Summit Apex Plus e no olho contralateral com o excimer laser Mel 70 (Aesculap-Meditec). RESULTADOS: A média do equivalente esférico (EE) pré-operatório foi de -4,74 no Summit, -4,8 no Mel 70, do pós-operatório de 1, 3, e12 meses foi 0,54; 0,58 e 0,014 no Summit e 0,02; 0,04 e -0,43 no Mel 70. Não houve diferença estatística significante entre eles em relação à acuidade visual sem correção (AVSC), acuidade visual com correção (AVCC), equivalente esférico (EE) nos tempos pré e pós-operatórios. Após 12 meses, 90,9% ficaram com AVCC=20/20 no Summit e 73% no Mel 70, 81,8% com AVSC =20/20 no Summit e 45,5% no Mel 70. Em relação ao EE aos 12 meses, 73% no Summit ficaram entre ±1,00D e 82% no Mel 70. Em relação à perda de 1 ou mais linhas tivemos 27,3% no Mel 70 e 9% no Summit. Complicações: 9% (2) casos de ceratite difusa lamelar e 45,5% de fibrose leve da borda do flap no Mel 70 em 1 ano de pós-operatório. CONCLUSÃO: Consideramos os 2 lasers eficientes e seguros para o tratamento de miopia e astigmatismo.

Descritores: Miopia; Astigmatismo; Estudo comparativo; Keratomileusis in situ assistida por excimer laser

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