Pieh Stefan, Kellner Christian, Hanselmayer Georg, Lackner Birgit, Schmidinger Gerald, Walkow Tony, Sticker Markus, Weghaupt Herbert, Fercher Adolf Friedrich, Skorpik Christian
Department of Ophthalmology and Optometry, Medical School, University of Vienna, Vienna, Austria.
J Cataract Refract Surg. 2002 Nov;28(11):1964-7. doi: 10.1016/s0886-3350(02)01317-2.
To evaluate how visual acuities at different distances correlate with results from defocus curves.
Department of Ophthalmology and Institute of Medical Physics, University of Vienna, Medical School, Vienna, and Department of Ophthalmology, Krankenhaus St. Pölten, St. Pölten, Austria.
This study comprised 15 eyes of 14 patients with a mean age of 67.9 years +/- 9.7 (SD) with a monofocal silicone intraocular lens (911A, Pharmacia). The best corrected distance visual acuity was determined at viewing distances of 6 m, 2 m, 1 m, 67 cm, 50 cm, 40 cm, and 33 cm using logMAR charts. Defocus curves were then evaluated from -3.0 to -0.5 diopter (D) at 0.5 D increments from the best distance correction at a viewing distance of 6 m.
The mean distance visual acuity was logMAR 0.08 +/- 0.07. The visual acuity graph from the testing at different distances was above the defocus graph at all testing points. Comparison of the visual acuity results from the 2 tests revealed statistically significant differences in the range from 2 m (-0.5 D) to 33 cm (-3.0 D).
Results of defocus curves disregard the diminutions of minus glasses, the normally restricted viewing distance to 6 m for distance acuity determination, and in particular the physiological miosis caused by the near-point reaction.
评估不同距离下的视力与散焦曲线结果之间的相关性。
维也纳医科大学维也纳大学眼科与医学物理研究所，以及奥地利圣珀尔滕 Krankenhaus 医院眼科。
本研究纳入了 14 例患者的 15 只眼，平均年龄为 67.9 岁±9.7（标准差），植入单焦点硅水凝胶人工晶状体（911A，法玛西亚）。使用对数视力表在 6 米、2 米、1 米、67 厘米、50 厘米、40 厘米和 33 厘米的观察距离下测定最佳矫正远视力。然后在 6 米观察距离下，从最佳距离矫正开始，以 0.5 屈光度（D）的增量，从 -3.0 至 -0.5 屈光度评估散焦曲线。
平均远视力为对数视力表 0.08±0.07。不同距离测试的视力图在所有测试点均高于散焦图。两项测试的视力结果比较显示，在 2 米（-0.5 D）至 33 厘米（-3.0 D）范围内存在统计学显著差异。
散焦曲线结果忽略了负透镜的减小、通常用于远视力测定的 6 米受限观察距离，尤其是近点反应引起的生理性瞳孔缩小。
