الفهرس 
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Abstract
The aim of this work is to evaluate the efficacy and safety of
ultraviolet A irradiation cross-linking on completion for laser-assisted in
situ keratomileusis (LASIK) in risky patients to avoid post Lasik ectasia.
For this purpose, 48 eyes of 30 myopic patients were presented for
Lasik. They were risky patients with corneal thickness more than 480 um
with or without astigmatism, postoperative residual stromal thickness not
less than 300 um.
After patients’ preparation, all cases had been performed on
Schwind Amaris, markers were made to corneal edge and a suction ring
was placed to minimize decentration, then 90 μm LASIK flap was created
with mechanical microkeratom. Lasik ablation was then applied. On
completion of the LASIK excimer ablation procedure, a DROP of 0.1%
riboflavin sodium phosphate solution was placed on the bare stromal bed,
and left to be soaked in for 60 seconds. Special care was taken not to allow
the riboflavin solution to come into contact with the already folded LASIK
flap. After adequate riboflavin absorption, the patient was positioned with
the UV light (typically 370 um) at a small distance (1-5cm) from the
corneal apex for 15 minutes.
The study showed an improvement in the spherical error and the
results showed a statistically highly significant difference (P <0.001).
The study showed also an improvement in the cylindrical error and
the results showed a statistically highly significant difference.