McDonnell P J
Doheny Eye Institute, Los Angeles, CA 90033.
Refract Corneal Surg. 1991 Jan-Feb;7(1):87-91.
The ability of the Corneal Modeling System to incorporate curvature and thickness data into a single mathematical construct of the cornea is an important achievement. As experience with this and similar instruments is gained, a number of important issues in corneal topography can be addressed. Snellen visual acuity, refraction, and keratometric changes do not fully reveal the effects of refractive surgical procedures. Detailed analysis of corneal topography will prove necessary to understanding the quality of vision resulting from surgery, as it can explain the disparity between uncorrected visual acuity and residual refractive error after radial keratotomy. Computer-assisted topographic measurement devices will undoubtedly play a particularly important role in the design and evaluation of current and future refractive procedures. Similarly, mild topographic changes (eg, subclinical keratoconus) can be detected that are not apparent with refraction, biomicroscopy, or keratometry. The author reviews his personal experience with one instrument.
角膜建模系统将曲率和厚度数据整合到角膜单一数学结构中的能力是一项重要成就。随着对该仪器及类似仪器使用经验的积累，角膜地形图学中的一些重要问题能够得到解决。斯内伦视力、验光和角膜曲率计测量的变化并不能完全揭示屈光手术的效果。角膜地形图的详细分析对于理解手术导致的视力质量很有必要，因为它可以解释放射状角膜切开术后未矫正视力与残余屈光不正之间的差异。计算机辅助地形图测量设备无疑将在当前及未来屈光手术的设计和评估中发挥特别重要的作用。同样，可以检测到一些轻微的地形图变化（如亚临床圆锥角膜），而这些变化在验光、生物显微镜检查或角膜曲率计测量中并不明显。作者回顾了他使用一种仪器的个人经验。
