Assessing visual performance with progressive addition lenses
Assessing visual performance with progressive addition lenses
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DOI：
10.1097/00006324-200208000-00012
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发表时间：
2002-08-01
影响因子：
1.4
通讯作者：
Ciuffreda, KJ
中科院分区：
文献类型：
--
作者：
Selenow, A;Bauer, EA;Ciuffreda, KJ
目的。由于镜头设计的限制，渐进式加法镜头（PAL）在中距离任务中呈现有限的视野，例如使用计算机。为了评估这种限制是否会导致视力下降，在计算机工作环境中，将PAL与单视力镜片在四种不同类型的阅读任务中进行了比较。方法。成年受试者在64厘米的中间距离上使用单视力透镜和PAL透镜完成了四项基于计算机的阅读任务。结果。单视力镜片在一项任务中的表现明显好于PAL镜片，在另一项任务中的表现也有更好的趋势。其余两项任务的表现没有差别。结论。在视觉表现测试中，涉及最宽视角的刺激和需要更多的注视转移的测试，在识别透镜设计之间的表现差异方面更为敏感。一般来说，PAL的表现与单视力透镜相比略有下降，可能是由于它们的中间通道受到限制。
Purpose. As a result of lens design limitations, progressive addition lenses (PAL's) present a limited field of view for tasks at intermediate distances, such as with computers. To assess whether this limitation results in diminished visual performance, PAL's were compared with single-vision lenses in four different types of reading tasks in a computer workplace environment. Methods. Adult subjects performed four computer-based reading tasks using both single-vision lenses and PAL's at an intermediate distance of 64 cm. Results. Single-vision lenses performed significantly better than PAL's in one task, with a trend for better performance in another task. There was no difference in performance for the remaining two tasks. Conclusions. Visual performance tests that involved stimuli subtending the widest visual angles and demanded more fixational shifts were more sensitive in discerning performance differences between the lens designs. In general, PAL's showed marginally diminished performance compared with single-vision lenses, presumably due to their restricted intermediate channel.