Lischwe T D, Ide C H
University of Missouri, Mason Institute of Ophthalmology, Columbia 65212.
Ophthalmology. 1988 Feb;95(2):256-60. doi: 10.1016/s0161-6420(88)33210-0.
A new method allows accurate testing of visual function behind mild-to-moderate cataracts or capsular opacities. Patients were asked to compare the number of corpuscles visualized with the blue field entoptoscope with a series of projected slides having progressively fewer drawn corpuscles. To standardize the equipment, the test was performed on 69 patients with varying degrees of macular impairment. Of the patients who selected 120 corpuscles or more, 89% had visual acuities of 20/40 or better, and those who selected 100 corpuscles or less, 82% had visual acuities of 20/50 or worse. The percentages were higher for age-related macular degeneration (ARMD) patients (100 and 85%) than for diabetic patients (33 and 75%). The same apparatus was then used to predict the potential visual acuity in 56 preoperative cataract or YAG-capsulotomy patients. Of the 23 patients with a preoperative acuity of 20/200 or better and who selected 120 corpuscles or more, 100% were 20/40 or better postoperatively.
一种新方法能够准确检测轻度至中度白内障或晶状体后囊混浊患者的视觉功能。研究人员要求患者使用蓝视标内视镜观察血细胞数量，并与一系列血细胞数量逐渐减少的投影幻灯片进行比较。为使设备标准化，该测试在69例不同程度黄斑损伤的患者中进行。选择120个或更多血细胞的患者中，89%的视力为20/40或更好；而选择100个或更少血细胞的患者中，82%的视力为20/50或更差。年龄相关性黄斑变性（ARMD）患者的这两个百分比（分别为100%和85%）高于糖尿病患者（分别为33%和75%）。随后，使用同一设备对56例白内障手术或YAG后囊切开术前患者的潜在视力进行预测。术前视力为20/200或更好且选择120个或更多血细胞的23例患者中，100%术后视力为20/40或更好。
