Kraff M C, Sanders D R, Lieberman H L
Ophthalmic Surg. 1978 Feb;9(1):81-4.
Two consecutive and sequential series of 100 pseudophakic patients were compared. In the first series intraocular lens power was determined by clinical means. In the second series axial length, using an easily operated commercially available A-scan unit, keratometry, and estimation of anterior chamber depth data were entered into an electronic calculator programmed to determine intraocular lens power. In the first series 47% of patients had a residual refractive error of 1 diopter or less, whereas 72% were within this range in the second series. With clinical lens power determination, there were three cases of residual deviation from emmetropia of more than 4 diopters; there was none greater than 3 diopters in the group using the A-scan. Lens power determination is more accurate using ultrasonography and the presently available instrumentation can be incorporated easily into a busy private practice.
对两组连续的各100例人工晶状体植入患者进行了比较。第一组通过临床方法确定人工晶状体的度数。第二组则使用易于操作的商用A超测量眼轴长度，进行角膜曲率测量，并将前房深度数据输入一台预先编程好以确定人工晶状体度数的电子计算器。在第一组中，47%的患者残余屈光不正为1屈光度或更低，而在第二组中这一比例为72%。采用临床晶状体度数测定时，有3例残余屈光不正偏离正视超过4屈光度；而在使用A超的组中，没有一例超过3屈光度。使用超声检查确定晶状体度数更为准确，并且目前可用的仪器可以轻松地融入繁忙的私人诊所。
