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Photorefractive keratectomy retreatment after LASIK
Waldir Neira-Zalentein1, Jukka A O Moilanen, Ilpo S Tuisku
1Department of Ophthalmology, University of Helsinki, Finland.
Purpose:
To study the results of late photorefractive keratectomy (PRK) in corneas originally subjected to LASIK.
Methods:
Seven eyes of seven patients who had LASIK for myopia were retreated with PRK at least 2 years after LASIK. Uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), refraction, and haze were evaluated before and after LASIK and after retreatment by PRK.
Results:
Photorefractive keratectomy retreatment improved BSCVA in six (86%) of seven eyes, and one (14%) eye showed no changes. None of the eyes lost lines of BSCVA. Five of seven eyes developed mild haze, which disappeared before the last postoperative follow-up.
Conclusions:
Photorefractive keratectomy retreatment performed at least 2 years after LASIK can improve visual acuity. We hypothesize that LASIK-induced corneal nerve damage disturbs corneal wound healing by increasing the tendency for development of haze.
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