McDonnell P J, Garbus J
Doheny Eye Institute, Los Angeles 90033.
Ophthalmology. 1989 Jan;96(1):45-9. doi: 10.1016/s0161-6420(89)32927-7.
A high resolution photokeratoscope using digital video image acquisition and computer graphics was used to describe anterior corneal topography before and after radial keratotomy. After radial keratotomy, the entire cornea is flattened, but this effect is more pronounced centrally. The flat central "optical zone" varies in size, shape, and location. Regional variations in corneal power may explain phenomena observed after radial keratotomy, such as visual acuity that is better than would be expected on the basis of refractive error, and the occurrence of ghost images.
一种使用数字视频图像采集和计算机图形技术的高分辨率角膜地形图仪被用于描述放射状角膜切开术前和术后的角膜前表面形态。放射状角膜切开术后，整个角膜变平，但这种效果在中央更为明显。平坦的中央“光学区”在大小、形状和位置上各不相同。角膜屈光力的区域差异可能解释了放射状角膜切开术后观察到的现象，如视力优于根据屈光不正预期的视力，以及重影的出现。
