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May 30, 2006
Laser in situ keratomileusis: Ablation on the flap and stromal bed in a primary treatment
JCRS Pages 590-594 (April 2006)
Purpose
To analyze outcomes of laser in situ keratomileusis (LASIK) performed on the flap and on the stromal bed at the same time in a primary treatment.
Twenty-two cases were studied retrospectively; the mean age of the patients was 33.15 years . Inclusion criteria were low pachymetry or topographic asymmetry,presented with topographic asymmetry (inferior–superior difference more than 1.5 diopters [D]). Ablation was performed on the flap from the back and on the bed. The flap was made using the Technolas Hansatome microkeratome and the ablation by the Technolas 217z excimer laser (both by Bausch & Lomb). Preop SE was −5.61 D, the cylinder was −1.78 D, and the BSCVA was 0.77 . Difficulties and complications of the technique, efficacy and safety index, and aberrations were analyzed.
Results
According to the surgical plan and our nomogram, diopters corrected on the flap were −1.73 and on the bed were −4.77 . The mean follow-up was 8.28 months. At 6 months, the SE was −0.21 , vectorial change was 1.69 , and the BSCVA was 0.77. Postop,no eye had an increase in refractive astigmatism. UCVA was 20/40 or better in all cases (100%) and 20/25 or better in 13 cases (59.1%). Regarding gained and lost lines of BSCVA, 54.5% conserved the lines, 18.2% lost 1 line, 9.1% gained 1 line, and 18.2% gained 2 lines.
Conclusions
Simultaneous ablation on the flap and on the bed in cases of low pachymetry or topographical asymmetry was predictable, effective, and safe.
Posted by alireza habibollahi at May 30, 2006 11:24 PM