Visual acuities "hand motion" and "counting fingers" can be quantified with the Freiburg visual acuity test
Visual acuities "hand motion" and "counting fingers" can be quantified with the Freiburg visual acuity test
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DOI：
10.1167/iovs.05-0981
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发表时间：
2006-03-01
影响因子：
4.4
通讯作者：
Bach, M
中科院分区：
文献类型：
--
作者：
Schulze-Bonsel, K;Feltgen, N;Bach, M
目的。视力低下患者的视力(VA)是用半定量的“数手指”(CF)、“手部运动”(HM)、“光感知”(LP)和“无光感知”来分类的。更多的量化措施将是可取的，特别是对于临床研究。比较临床视力、早期治疗糖尿病视网膜病变研究(ETDRS)表和Freiburg视力测试(FRACT)的结果。FRACT是一种计算机化的视力测试，在必要时可以显示非常大的Landolt C眼型。方法：检查了100名患有各种眼病(如糖尿病视网膜病变，ARMD)的患者的100只眼，范围从LP到十进制0.32。FRACT的光型显示在一台17英寸的任意方向的LCD显示器上。经过广泛的训练，获得了两个ETDRS和FRACT测量结果。测试距离为50或100 cm。结果当VA>；=0.02(n-80)时，ETDRS法与FRACT法吻合较好。ETDRS测量可以成功地测量到Cf(在30厘米处；所有患者的平均重测，变异系数[CV](ETDRS)=9%+/-8%)，FRACT提供了直到HM的可重复性测量(重测CVFrACT=12%+/-11%)。对于CF(n=6)，ETDRS和FRACT的平均视力均为0.014+/-0.003。FRACT对HM(n=12)的VA值为0.005+/-0.002(范围0.003-0-009)，个体数值重复性高。Lp(n=2)无结果。结论：三种手术的视力均在0.02以上。结果表明，使用ETDRS或FRACT，30厘米处的CF类别可以被0.014取代。使用FRACT，人们甚至可以重复地量化HM范围内的VA，得到平均VA为0.005。
PURPOSE. The visual acuity (VA) of patients with very low vision is classified using the semiquantitative scale "counting fingers" (CF), "hand motion" (HM), "light perception" (LP), and "no light perception." More quantitative measures would be desirable, especially for clinical studies. The results of clinical VA measurements, Early Treatment Diabetic Retinopathy Study (ETDRS) charts, and the Freiburg Visual Acuity Test (FrACT) were compared. The FrACT is a computerized visual acuity test that can present very large Landolt C optotypes when necessary.METHODS. Examined were 100 eyes of 100 patients with various eye diseases (e.g., diabetic retinopathy, ARMD), covering a range of VAs from LP to decimal 0.32. The FrACT optotypes were presented on a 17-inch LCD monitor with random orientation. After extensive training, two ETDRS and FrACT measurements were obtained. The testing distance was 50 or 100 cm.RESULTS. ETDRS and FrACT coincided closely for VA >= 0.02 (n - 80). ETDRS measures were successfully obtainable down to CF (at 30 cm; test-retest averaged over all patients, coefficient of variation [CV](ETDRS) = 9% +/- 8%), and FrACT provided reproducible measurements down to HM (test-retest CVFrACT = 12% +/- 11%). For CF (n = 6), both ETDRS and FrACT resulted in a mean VA of 0.014 +/- 0.003 (range, 0.01-0.02). The VA results of FrACT for HM (n = 12) were 0.005 +/- 0.002 (range, 0.003-0-009); the individual values were highly reproducible. No results were obtainable for LP (n = 2).CONCLUSIONS. The three acuity procedures concur above a VA of 0.02. The results suggest that the category CF at 30 cm can be replaced by 0.014, using ETDRS or FrACT. Using FrACT, one can even reproducibly quantify VA in the HM-range, yielding a mean VA of 0.005.