Ismail M M, Pérez-Santonja J J, Alió J L
Refractive Surgery Unit, Instituto Oftalmológico de Alicante, Spain.
J Cataract Refract Surg. 1999 Feb;25(2):212-5. doi: 10.1016/s0886-3350(99)80128-x.
To evaluate the effect of laser thermokeratoplasty (LTK) in eyes that previously had a lamellar corneal cut.
University of Al-Azhar, Cairo, Egypt, and Instituto Oftalmológico de Alicante, Spain.
In 15 eyes (10 patients), noncontact LTK was applied 6 to 8 weeks after a lamellar corneal cut had been made. Central pachymetry, keratometry, and videokeratography were performed and uncorrected visual acuity, best spectacle-corrected visual acuity (BSCVA), and manifest and cycloplegic refractions measured before and 1, 6, 12, and 18 months after LTK.
Mean follow-up was 19.13 months. Mean refraction was +5.93 diopters (D) +/- 1.9 (SD) before LTK and -0.43 +/- 1.5 D at 1 month, +1.63 +/- 1.6 D at 6 months, 1.91 +/- 1.41 at 12 months, and +2.01 +/- 1.5 D at the end of the study. Total regression did not occur in any case. Mean BSCVA before LTK was 0.66 +/- 0.2, and spontaneous visual acuity at the end of the study was 0.58 +/- 0.18. No patient lost any lines of preoperative BSCVA. There was no significant difference between the results at 12 months and at the end of the study.
Corneal lamellar cutting appeared to improve the magnitude of the refractive effect of noncontact LTK and to decrease the amount of regression.
评估激光角膜热成形术（LTK）对既往有板层角膜切开术的眼睛的效果。
埃及开罗的爱资哈尔大学以及西班牙阿利坎特眼科研究所。
对10例患者的15只眼睛，在板层角膜切开术后6至8周进行非接触式LTK。在LTK术前、术后1、6、12和18个月进行中央角膜厚度测量、角膜曲率测量和角膜地形图检查，并测量未矫正视力、最佳眼镜矫正视力（BSCVA）以及显验光和睫状肌麻痹验光。
平均随访时间为19.13个月。LTK术前平均屈光度为+5.93屈光度（D）±1.9（标准差），术后1个月为-0.43±1.5 D，6个月为+1.63±1.6 D，12个月为1.91±1.41，研究结束时为+2.01±1.5 D。在任何情况下均未发生完全回退。LTK术前平均BSCVA为0.66±0.2，研究结束时的自发视力为0.58±0.18。没有患者的术前BSCVA下降超过一行。12个月时的结果与研究结束时的结果之间无显著差异。
板层角膜切开术似乎提高了非接触式LTK的屈光效果幅度，并减少了回退量。
