Du L T, Wessels I F, Underdahl J P, Auran J D
Edward S. Harkness Eye Institute, Columbia University, New York, NY 10032, USA.
Binocul Vis Strabismus Q. 2001;16(1):61-7.
To evaluate the effect of instrument magnification used in eye surgery on stereoacuity and depth perception.
Twenty-one subjects (10 clinical ophthalmologists familiar with loupes and operating microscopes and 11 non-ophthalmologists) with normal near vision and stereoacuity were tested with the Randot Stereotest viewed unmagnified, with a 4x loupes (450 mm focal length), and with a 16x operating microscope.
Total scores: 8 errors in 210 test steps with the unmagnified observations, 25/210 with loupes, and 30/210 with the microscope. The statistical differences in these scores were "statistically highly significant" for all three tests (p = 0.002); and "significant" for the unmagnified versus loupe (p = 0.007) and unmagnified versus microscope (p = 0.002). Test viewing through the microscope, the greatest errors occurred (total errors = 1840 seconds of arc), less with the loupes (total 1150") and least without magnification (total 220"). Errors and scores for 10 experienced ophthalmologists were no different (p > or = 0.55, p = 1.00) from the 11 non-ophthalmologist subjects.
Stereoacuity and depth perception decrease when viewing a test target with loupes or with a microscope, with the effect worsening as magnification increases. Familiarity with the magnifying equipment did not improve stereoacuity.
评估眼科手术中使用的器械放大倍数对立体视锐度和深度感知的影响。
对21名近视力和立体视锐度正常的受试者（10名熟悉头戴式放大镜和手术显微镜的临床眼科医生以及11名非眼科医生）进行测试，使用朗多立体视测试，分别在未放大、使用4倍头戴式放大镜（焦距450毫米）和16倍手术显微镜的情况下进行观察。
总分：未放大观察时，210个测试步骤中有8个错误；使用头戴式放大镜时，210个步骤中有25个错误；使用显微镜时，210个步骤中有30个错误。这三项测试中这些分数的统计差异在所有三项测试中均为“高度显著”（p = 0.002）；未放大与头戴式放大镜之间为“显著”（p = 0.007），未放大与显微镜之间为“显著”（p = 0.002）。通过显微镜观察测试时，错误最多（总误差 = 1840角秒），使用头戴式放大镜时较少（总计1150角秒），未放大时最少（总计220角秒）。10名经验丰富的眼科医生的错误和分数与11名非眼科医生受试者没有差异（p≥0.55，p = 1.00）。
使用头戴式放大镜或显微镜观察测试目标时，立体视锐度和深度感知会下降，且随着放大倍数增加，这种影响会加剧。对放大设备的熟悉程度并未提高立体视锐度。
