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Posterior corneal elevation not affected by partial flap creation

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NEW DEHLI, India — Inadvertently creating a partial flap during LASIK does not contribute to an increase in posterior corneal elevation, according to a case series.

Rasik B. Vajpayee, MBBS, MS, and colleagues here at the All India Institute of Medical Sciences studied the records of 16 patients who had partial flap in one eye during LASIK and uncomplicated surgery in the fellow eye. Laser ablation was abandoned in all eyes after the partial flap was created. Initially, a 160/180 µm flap was attempted with a Hansatome microkeratome (Bausch & Lomb). After a mean interval of 4 months, LASIK was performed using a 180-µm plate.

Posterior corneal elevation was comparable in the two groups of eyes, both preoperatively and after the final surgery. In the partial-flap group of eyes, the posterior corneal elevation was raised to 16.9 µm from 16.4 µm, which was not statistically significant.

“On a multiple linear regression analysis, residual bed thickness was independently the significant determinant of final posterior corneal elevation in both groups,” study authors wrote.

The study is published in the February issue of British Journal of Ophthalmology.