Dausch D, Schröder E, Dausch S
Augen-Laser-Klinik Nürnberg, Germany.
J Refract Surg. 2000 Jan-Feb;16(1):13-22. doi: 10.3928/1081-597X-20000101-03.
To assess whether photorefractive keratectomy (PRK) controlled by videokeratography can successfully treat refractive errors in eyes with corneal irregularities and improve spectacle-corrected visual acuity.
In a prospective clinical study, PRK was performed in 10 eyes of 10 patients. Reason for surgery was irregular astigmatism after penetrating keratoplasty, corneal irregularity after corneal scarring, corneal astigmatism in keratoconus, and decentration after myopic and hyperopic PRK. Excimer ablation was controlled by preoperative videokeratography (Orbscan II, Orbtek) using the MEL-70 system from Aesculap Meditec. Follow-up was 6 months.
Concerning manifest refraction, the sphere was reduced on average from +1.92 to +0.57 D, 6 months postoperatively. Cylinder changed from -1.95 D on average to -0.30 D at 6 months postoperatively. There was improvement of uncorrected visual acuity of 2 or more lines in 5 eyes and no change in 5 eyes 6 months postoperatively. Spectacle-corrected visual acuity improved in 2 eyes by 2 to 3 lines, in 9 eyes by 1 to 3 lines, and showed no change in 1 eye.
Videokeratography-controlled PRK improved refractive errors in irregular corneas with improvement of spectacle-corrected visual acuity.
评估通过角膜地形图引导的准分子激光原位角膜磨镶术（PRK）能否成功治疗角膜不规则的眼睛的屈光不正，并提高框架眼镜矫正视力。
在一项前瞻性临床研究中，对10例患者的10只眼睛进行了PRK。手术原因包括穿透性角膜移植术后不规则散光、角膜瘢痕后角膜不规则、圆锥角膜的角膜散光以及近视和远视PRK后的偏心。使用Aesculap Meditec的MEL-70系统，通过术前角膜地形图（Orbscan II，Orbtek）控制准分子激光消融。随访6个月。
关于明显屈光不正，术后6个月时，球镜平均从+1.92 D降至+0.57 D。柱镜平均从-1.95 D变为术后6个月时的-0.30 D。术后6个月，5只眼睛的裸眼视力提高了2行或更多行，5只眼睛无变化。2只眼睛的框架眼镜矫正视力提高了2至3行，9只眼睛提高了1至3行，1只眼睛无变化。
角膜地形图引导的PRK改善了不规则角膜的屈光不正，并提高了框架眼镜矫正视力。
