Nardi M, Rizzo S, Pellegrini G, Lepri A
Institute of Ophthalmology, University of Pisa, Italy.
J Pediatr Ophthalmol Strabismus. 1997 Jul-Aug;34(4):244-6. doi: 10.3928/0191-3913-19970701-13.
Changes in refraction follow surgery on the extraocular muscles. We examined corneal topography before and after medial or lateral rectus muscle recession using a computer-assisted topographic analysis system.
A total of 36 patients (52 eyes) were examined. Measurements were taken 1 day before surgery and 1, 15, and 30 days after surgery.
A significant change in astigmatic power was detected 1 day after surgery in the meridian of the recessed muscle, evidencing a localized flattening of the cornea. Induced astigmatism decreased over time. At 30 days following surgery, 6% of patients evidenced a residual change higher than 1 diopter (D); 12% evidenced a residual change higher than 0.5 D.
The increase of astigmatic power recorded 1 day after surgery is higher for medial rectus muscle recession than for lateral rectus muscle recession. Corneal topography changes, located mainly in the meridian of the recessed muscle and the optical zone, are greatly reduced or gone within 1 month of surgery.
眼外肌手术后会出现屈光变化。我们使用计算机辅助地形分析系统检查了内直肌或外直肌后徙术前及术后的角膜地形图。
共检查了36例患者（52只眼）。在手术前1天以及手术后1天、15天和30天进行测量。
手术后1天，在肌肉后徙的子午线上检测到散光度数有显著变化，表明角膜出现局部变平。诱导性散光随时间减少。手术后30天，6%的患者残余变化高于1屈光度（D）；12%的患者残余变化高于0.5 D。
内直肌后徙术后1天记录到的散光度数增加比外直肌后徙术后更高。角膜地形图变化主要位于后徙肌肉的子午线和光学区，在手术后1个月内大大减少或消失。
