Videokeratographic changes after laser in situ keratomileusis to correct high myopia.

摘要

PURPOSE: To evaluate the videokeratographic changes and patterns after laser in situ keratomileusis (LASIK) in high myopia using computerized videokeratography. SETTING: San Salvatore Hospital, Chair of Ophthalmology, University of L'Aquila, L'Aquila, Italy. METHODS: Forty-one eyes of 26 patients treated with no-suture nasal-hinged flap LASIK for an attempted mean spherical equivalent correction of -13.9 diopters (D) +/- 4.1 (SD) (range -8.0 to -22.0 D) were evaluated. Mean patient age was 35.2 +/- 9.8 years. Mean follow-up was 15.1 +/- 6.7 months (range 6 to 26 months). RESULTS: Thirty-five eyes (85.4%) were within +/- 2.0 D of the planned correction, with a refractive error greater than 3.0 D in the 7.3% of eyes. Mean central corneal power decreased from 43.2 +/- 1.8 D (range 38.70 to 47.40 D) to 35.8 +/- 3.8 D (range 30.3 to 42.6 D). Mean preoperative corneal astigmatism decreased from 1.2 +/- 0.9 D (range 0.2 to 4.2 D) to 0.9 +/- 0.9 D (range 0.2 to 3.3 D). Videokeratographic qualitative analysis showed corneal shape changes within 15 days after surgery. Corneal patterns then stabilized, and 37 eyes (90.3%) had no significant modifications in corneal refractive power after 1 month. CONCLUSION: After LASIK in highly myopic eyes, videokeratographic maps showed corneal power stabilized within 1 month in most eyes and there was no irregular astigmatism if the treatment was well centered.