Pesudovs K, Brennan N A
Department of Optometry, University of Melbourne, Parkville, Australia.
Optom Vis Sci. 1993 Jul;70(7):528-31. doi: 10.1097/00006324-199307000-00002.
Myopes of low degree commonly report that their vision seems poorer upon removal of their spectacles compared to that after a period without spectacle wear. Notably, this difference in vision can be appreciated after distance fixation. In this paper, we propose and test several alternative hypotheses to explain the phenomenon: an accommodative response to spectacles, sensory adaptation, or altered criteria for blur of psychological origin. We measured visual acuity (VA), refractive error, and lens thickness on 10 subjects with less than 2.00 D of myopia. Testing was performed after two 90-min sessions viewing at distance. At one session, the subjects wore their current spectacle correction and, at the other session, no correction was worn. VA underwent a slight but significant decrease (0.4 of a line) after the session in which spectacles were worn, but no difference in refractive error or lens thickness was found. The change in acuity in the absence of a refractive shift suggests sensory adaptation to blur. However, the demonstrated change in VA appears to be less than that which is subjectively reported; accordingly, psychological input cannot be ruled out.
低度近视者通常表示，与一段时间不戴眼镜后相比，摘下眼镜时他们的视力似乎更差。值得注意的是，这种视力差异在远距离注视后就能察觉到。在本文中，我们提出并检验了几种替代假设来解释这一现象：对眼镜的调节反应、感觉适应或心理源性模糊标准的改变。我们对10名近视度数低于2.00 D的受试者测量了视力（VA）、屈光不正和晶状体厚度。在进行了两个90分钟的远距离观察 session 后进行测试。在其中一个 session 中，受试者佩戴他们当前的眼镜矫正，而在另一个 session 中，则不佩戴矫正眼镜。佩戴眼镜的 session 后，VA 出现了轻微但显著的下降（一行的0.4），但未发现屈光不正或晶状体厚度有差异。在没有屈光变化的情况下视力的改变表明对模糊的感觉适应。然而，所显示的VA变化似乎小于主观报告的变化；因此，不能排除心理因素的影响。
