Effect of age on visual and refractive results after laser-assisted subepithelial keratomileusis (LASEK) with adjuvant use of mitomycin C / Efecto de la edad en los resultados visuales y refractivos después de la queratomileusis subepitelial asistida por láser (LASEK) con el uso adyuvante de mitomicina C

Purpose: To evaluate the influence of age on visual and refractive results after laser-assisted subepithelial keratomileusis (LASEK) with the adjuvant use of mitomycin C (MMC) for the correction of myopia. Methods: Retrospective, nonrandomized, cohort study. A total of 1374 eyes treated with LASEK+MMC were included in the study (we compared 1163 eyes of patients aged 18 to 40 years versus 211 eyes of patients over 40 years). Visual and refractive results were evaluated at the 6-month postoperative visit. Results: Six months postoperatively, both the uncorrected distance visual acuity and the corrected distance visual acuity were significantly better in the group of young patients ( P= 0.0001). We found a slight tendency to overcorrection in the group of young patients compared to a slight tendency to undercorrection in the group of patients over 40 years (P = 0.002). The efficacy index was significantly better in the group of younger patients (0.91 ± 0.2) than in the older patients (0.86±0.2) (P = 0.0001). No significant difference was found in the safety index between groups. 81.5% of eyes in the group of patients aged 18 to 40 years compared to 75.3% of eyes in the group of patients aged >40 years were within ± 0.5D of emmetropia ( P= 0.001). Conclusions: A tendency toward undercorrection and less predictability was found with aging after myopic LASEK with MMC for the correction of myopia

Objetivo: Evaluar la influencia de la edad sobre los resultados visuales y refractivos tras queratomileusis subepitelial asistida por láser (LASEK) con uso adyuvante de mitomicina C (MMC) para la corrección de la miopía. Métodos: Estudio de cohorte retrospectivo y no aleatorizado. Se incluyó en el estudio a un total de 1.374 ojos tratados con LASEK + MMC (comparamos 1.163 ojos de pacientes de edades comprendidas entre 18 y 40 años, con 211 ojos de pacientes mayores de 40 años). Los resultados visuales y refractivos se evaluaron durante la visita postoperatoria transcurridos 6 meses. Resultados: A los seis meses de la intervención, tanto la agudeza visual de lejos no corregida como corregida fueron mejores en el grupo de pacientes jóvenes (P = 0,0001). Encontramos una ligera tendencia hacia la sobre-corrección en el grupo de pacientes jóvenes, en comparación a una ligera tendencia hacia la infra-corrección en el grupo de pacientes mayores de 40 años (P = 0,002). El índice de eficacia fue significativamente mejor en el grupo de pacientes jóvenes (0,91 ± 0,2) que en el de pacientes mayores (0,86 ± 0,2) (P = 0,0001). No se encontró diferencia significativa en cuanto al índice de seguridad entre grupos. El 81,5% de los ojos del grupo de pacientes con edades comprendidas entre 18 y 40, en comparación con el 75,3% de los ojos en el grupo de pacientes mayores de >40 años, reflejó un valor±0,5D de emetropía (P = 0,001). Conclusiones: Se encontró una tendencia hacia la infra-corrección y menor predecibilidad con la edad tras la realización de LASEK con MMC para la corrección de la miopía

Effect of age on visual and refractive results after LASIK: mechanical microkeratome versus femtosecond laser.

AIM: To evaluate the effect of age on visual and refractive results after laser in situ keratomileusis (LASIK) obtained with a mechanical microkeratome or a femtosecond laser. METHODS: Retrospective, nonrandomized, cohort study. A total of 3826 eyes were included in the study (1725 eyes treated with mechanical LASIK and 2101 eyes treated with femtosecond LASIK). The relationship between patient age and the 3-month postoperative visual and refractive results of both procedures were analyzed by linear regression analysis. RESULTS: Three months postoperatively, we found a significant correlation between age and the postoperative spherical equivalent (SE; r 2=0.004, P=0.006), efficacy (r 2=0.006, P=0.001), and safety indexes (r 2=0.05, P=0.0001) in the mechanical LASIK group. On the other hand, we found a significant correlation between age and the postoperative SE (r 2=0.02, P=0.0001) and the efficacy index (r 2=0.01, P=0.0001) but not the safety index in the femtosecond laser group. Mechanical LASIK provided slightly but significantly better efficacy and predictability in patients 18 to 40 years of age and femtosecond LASIK did so in patients older than 40 years of age. The femtosecond laser provided better safety results than the mechanical microkeratome in both age groups. CONCLUSION: A tendency toward undercorrection and less predictability is found with aging after myopic LASIK regardless of whether the flap was created with a mechanical microkeratome or a femtosecond laser. However, femtosecond laser provides significantly better outcomes in terms of efficacy, safety and predictability compared to mechanical microkeratome for the correction of myopia in patients over 40y.

Effect of age on visual and refractive results after laser-assisted subepithelial keratomileusis (LASEK) with adjuvant use of mitomycin C.

PURPOSE: To evaluate the influence of age on visual and refractive results after laser-assisted subepithelial keratomileusis (LASEK) with the adjuvant use of mitomycin C (MMC) for the correction of myopia. METHODS: Retrospective, nonrandomized, cohort study. A total of 1374 eyes treated with LASEK+MMC were included in the study (we compared 1163 eyes of patients aged 18 to 40 years versus 211 eyes of patients over 40 years). Visual and refractive results were evaluated at the 6-month postoperative visit. RESULTS: Six months postoperatively, both the uncorrected distance visual acuity and the corrected distance visual acuity were significantly better in the group of young patients (P=0.0001). We found a slight tendency to overcorrection in the group of young patients compared to a slight tendency to undercorrection in the group of patients over 40 years (P=0.002). The efficacy index was significantly better in the group of younger patients (0.91±0.2) than in the older patients (0.86±0.2) (P=0.0001). No significant difference was found in the safety index between groups. 81.5% of eyes in the group of patients aged 18 to 40 years compared to 75.3% of eyes in the group of patients aged >40 years were within±0.5D of emmetropia (P=0.001). CONCLUSIONS: A tendency toward undercorrection and less predictability was found with aging after myopic LASEK with MMC for the correction of myopia.

Long-term Follow-up of LASEK With Mitomycin C Performed to Correct Myopia in Thin Corneas.

PURPOSE: To evaluate the long-term outcomes of laser-assisted subepithelial keratomileusis (LASEK) with intraoperative use of mitomycin C (MMC) performed on thin corneas for the correction of myopia. METHODS: This retrospective cohort study included 100 eyes with a preoperative central corneal thickness (CCT) thinner than 500 µm that underwent LASEK + MMC with at least 6 years of follow-up. Stability of visual acuity and refraction and the efficacy, safety, and predictability at the examinations 3 months and the last annual postoperative visit were analyzed. RESULTS: Preoperative CCT was 482.9 ± 14.7 µm (range: 433 to 499 µm). Mean preoperative spherical equivalent was -4.09 ± 2.3 diopters (D). At the 3-month postoperative visit, mean CCT was 419.79 ± 32.6 µm. The residual spherical equivalent showed a statistically significant regression (P = .001) in the comparison between the 3-month and the last annual postoperative visit. The efficacy index showed a significant decrease (P = .01) and the safety index remained stable around 0.96. Six or more years after the surgery, 85 eyes (85%) were within ±0.50 D and 94 eyes (94%) eyes were within ±1.00 D of emmetropia. The topography did not show signs of secondary corneal ectasia in any eye. CONCLUSIONS: LASEK with intraoperative use of MMC seems to be safe, effective, and predictable to correct myopia in corneas thinner than 500 µm and with normal preoperative topography, providing good visual and refractive outcomes with no topographic signs of corneal ectasia in a mean 6.5-year follow-up. [J Refract Surg. 2017;33(12):813-819.].