[YAG 激光后发性白内障切开术对视觉功能的影响]

[Effect of YAG capsulotomy of secondary cataracts on visual functions].

Langrová H, Hejcmanová D, Peregrin J, Bytton L, Hovorková M

Ocní klinika FN, Hradec Králové.

Cesk Slov Oftalmol. 2002 Sep;58(5):292-7.

Abstract

20 patients (20 eyes) with secondary cataract and best corrected visual acuity (BCVA) of 20/30 or 20/20 using Snellen charts were examined before Nd-YAG capsulotomy and 14 days postoperatively. 2. Contrast sensitivity (CS) was tested on a computerized system of the Contrast sensitivity 8010 type and on VCTS charts in 6 spatial frequencies, BCVA was measured on the logMAR charts with Landolt rings and influence of glare of 342.6 cd/m2 was tested using Brightness Acuity Tester (BAT). 3. BCVA (without and under glare) in patients before and after YAG capsulotomy was significantly lower compared to the control group (p < 0.001). Postoperative improvement of BCVA was markedly higher on logMAR charts (up to 6.6 standardized lines) than using Snellen charts (1 line). 4. CS (without and under glare) using both methods in patients before and after YAG capsulotomy was significantly lower compared to the control group (p < 0.05 to p < 0.001) in spite of significant improvement postoperatively (p < 0.05 to p < 0.001), first of all at intermediate and high spatial frequencies. 5. Glare had only nonsignificant influence on BCVA and CS in all groups.

摘要

选取20例（20只眼）继发性白内障患者，其使用斯内伦视力表测得的最佳矫正视力（BCVA）为20/30或20/20，在进行Nd-YAG晶状体囊切开术前及术后14天进行检查。2. 使用Contrast sensitivity 8010型计算机系统及VCTS图表在6个空间频率下测试对比敏感度（CS），使用带兰多尔特环的对数视力表测量BCVA，并使用亮度视力测试仪（BAT）测试342.6 cd/m²眩光的影响。3. YAG晶状体囊切开术前和术后患者的BCVA（无眩光及有眩光情况下）与对照组相比显著更低（p < 0.001）。术后BCVA在对数视力表上的改善（高达6.6条标准线）明显高于使用斯内伦视力表（1条线）。4. YAG晶状体囊切开术前和术后患者使用两种方法测得的CS（无眩光及有眩光情况下）与对照组相比显著更低（p < 0.05至p < 0.001），尽管术后有显著改善（p < 0.05至p < 0.001），首先是在中高空间频率。5. 眩光对所有组的BCVA和CS仅有不显著的影响。