Kwapiszeski B R, Gallagher C C, Holmes J M
Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota 55905, USA.
J Cataract Refract Surg. 1996 May;22(4):441-5. doi: 10.1016/s0886-3350(96)80039-3.
To determine whether stereoacuity is an objective indicator of functional improvement following unilateral cataract surgery.
Department of Opthalmology, Loyola University Chicago, Maywood, Illinois.
Seventeen consecutive patients with unilateral cataracts (8 pseudophakic, 9 phakic in contralateral eye) were studied prospectively. Best corrected distance visual acuity in the eye with cataract ranged from 20/40 to 20/400. Distance acuity in the eye without cataract was 20/20 or 20/25. All patients had cataract surgery with posterior chamber intraocular lens implantation. Stereoacuity was measured preoperatively and postoperatively; at near by Titmus test (TT) and at distance by B-VAT BVS random dot E (BVRDE) and contour circles (BVC). Nonparametric Spearman rank correlation and Wilcoxon rank tests were used for analysis.
Preoperatively, reduced near visual acuity in the cataractous eye correlated with reduced near stereo (TT), r = .6, P = .01. Postoperatively, near stereoacuity improved in all but one patient, from a median of 200 seconds of arc (sec arc) to 40 sec arc (P = .004); distance stereoacuity improved in all but two patients from a median of unrecordable to 120 sec arc (BVC) (P = .006). Preoperatively none of the patients could see the largest distance BVRDE target, whereas postoperatively 4 of 17 had BVRDE stereoacuity of 120 to 240 sec arc (P = .06).
Patients with unilateral cataracts have reduced stereoacuity, correlating with their reduced monocular visual acuity. In this study, distance and near stereoacuity improved postoperatively. Decreased stereoacuity may provide an indication for unilateral cataract surgery.
确定立体视锐度是否为单侧白内障手术后功能改善的客观指标。
伊利诺伊州梅伍德市芝加哥洛约拉大学眼科。
对17例连续性单侧白内障患者（8例人工晶状体眼，9例对侧眼为晶状体眼）进行前瞻性研究。白内障眼的最佳矫正远视力范围为20/40至20/400。无白内障眼的远视力为20/20或20/25。所有患者均接受白内障手术并植入后房型人工晶状体。术前和术后测量立体视锐度；近距离通过Titmus试验（TT）测量，远距离通过B-VAT BVS随机点E（BVRDE）和轮廓圆（BVC）测量。采用非参数Spearman秩相关和Wilcoxon秩检验进行分析。
术前，白内障眼近视力下降与近立体视（TT）下降相关，r = 0.6，P = 0.01。术后，除1例患者外，所有患者的近立体视锐度均有所改善，从中位数200角秒（sec arc）提高到40角秒（P = 0.004）；除2例患者外，所有患者的远立体视锐度均有所改善，从中位数不可记录提高到120角秒（BVC）（P = 0.006）。术前，所有患者均无法看清最大的远距离BVRDE视标，而术后17例中有4例的BVRDE立体视锐度为120至240角秒（P = 0.06）。
单侧白内障患者的立体视锐度降低，与其单眼视力下降相关。在本研究中，远、近立体视锐度术后均有所改善。立体视锐度降低可能为单侧白内障手术提供指征。
