Treatment of halos after photorefractive keratectomy.

摘要: BACKGROUND Some patients, despite a good visual outcome after photorefractive keratectomy (PRK), have severe problems with halos. METHODS Ten eyes near-plano refraction PRK were treated again to reduce The goal of the second surgery was enlarge diameter treatment zones without changing obtained by first surgery. zone enlarged from 5 or 6 mm 7 mm. In in which multizone technique used PRK, amount correction increased transition zone. However, refractive power central 4 5-mm not altered. This result calculating desired on large (6 mm) and then for same smaller (4 mm). latter, would produce changes curvature zone, is subtracted overall treatment. Only part where laser beam delivered eye. this process, only peripheral modified. deepened but its remained same. RESULTS A decrease symptoms noticed seven ten patients. all eyes, initial significantly changed best results milder myopic patients who had their small ablation CONCLUSION Halos can be reduced repeating increasing PRK.