Röver J, Bornkessel H C, Nisius A, Bach M
Augenklinik Bielefeld.
Klin Monbl Augenheilkd. 1996 Nov;209(5):315-6. doi: 10.1055/s-2008-1035325.
Especially in aged patients testing the visual acuity can be most time consuming. An automatic test could therefore be of great help. The recently introduced "Freiburg Visual Acuity Test' (FVT) using a forced-choice determination of Landolt orientation has proved a reliable method of automatic visual acuity testing in younger patients.
To learn about practicability and ease of this self-administered test, we tried this test in 87 patients (mean age 73) before and after cataract surgery. The Landolt ring was presented in 8 different positions on a monitor. A keyboard of 8 buttons, depicting the possible orientation of the Landolt C, allowed the patients to run through the test by themselves. With each patient's correct response, the size of the Landolt ring decreased accordingly.
Although near vision of all patients was grossly impaired and accommodation power zero, handling of the keyboard for the subject's response was generally reported as easy. The reliability and reproducibility of the obtained values were good and close to acuity values obtained using projected test figures according to DIN. Prior to cataract surgery we found DIN values statistically significantly lower than FVT values. This difference did not persist after surgery.
Although the tested patients were definitely no computer freaks, the procedure of the test was rapidly understood. The average testing time was 4.5 min, thus prolonged by 40% in comparison to assisted DIN testing, however consuming only 1.0 min of personnel's time. The test proved to be equally reliable in the elderly patient.
尤其是在老年患者中，测试视力可能非常耗时。因此，自动测试可能会有很大帮助。最近推出的“弗莱堡视力测试”（FVT）采用强制选择确定兰多尔特环的方向，已被证明是一种在年轻患者中进行自动视力测试的可靠方法。
为了了解这种自我管理测试的实用性和便捷性，我们在87例（平均年龄73岁）白内障手术前后的患者中进行了这项测试。兰多尔特环在显示器上呈现8个不同位置。一个有8个按钮的键盘，描绘了兰多尔特C的可能方向，使患者能够自行完成测试。随着每个患者的正确回答，兰多尔特环的大小相应减小。
尽管所有患者的近视力严重受损且调节能力为零，但总体上患者报告使用键盘进行回答很容易。所获得值的可靠性和可重复性良好，且接近根据德国工业标准（DIN）使用投影测试图形获得的视力值。在白内障手术前，我们发现DIN值在统计学上显著低于FVT值。手术后这种差异不再存在。
尽管测试的患者肯定不是电脑高手，但测试过程很快被理解。平均测试时间为4.5分钟，因此与辅助DIN测试相比延长了40%，但仅消耗工作人员1.0分钟的时间。该测试在老年患者中同样可靠。
