Aston University, School of Life and Health Sciences, Ophthalmic Research Group, Birmingham, United Kingdom.
J Cataract Refract Surg. 2011 Mar;37(3):454-60. doi: 10.1016/j.jcrs.2010.09.022.
To examine the effect of uncorrected astigmatism in older adults.
University vision clinic.
Investigational simulation.
Healthy adult presbyopes had astigmatism of 0.00 to -4.00 diopters cylinder (DC) × 90 degrees and -3.00 DC × 90, × 180, and × 45 degrees induced with spectacle lenses, with the mean spherical equivalent compensated to plano, in random order. Visual acuity was assessed binocularly using a computerized test chart at 95%, 50%, and 10% contrast. Near acuity and reading speed were measured using standardized reading texts. Light scatter was quantified with a C-Quant straylight meter and driving reaction times with a computer simulator. Visual clarity of a mobile phone and computer screen was subjectively rated.
Distance visual acuity in the 21 volunteers decreased with increasing uncorrected astigmatic power (F = 174.50, P < .001) and at lower contrasts (F = 170.77, P < .001). Near visual acuity and reading speed also decreased with increasing uncorrected astigmatism power (P < .001). Light scatter was not significantly affected by uncorrected astigmatism (P > .05); however, the reliability and variability of measurements decreased with increasing uncorrected astigmatic power (P < .05). Driving simulator performance was unaffected by uncorrected astigmatism (P > .05), although subjective rating of clarity decreased with increasing uncorrected astigmatic power (P < .001). Uncorrected astigmatism at the 45-degree or 180-degree orientation resulted in worse distance and near visual acuity and subjective-rated clarity than at the 90-degree orientation (P < .05).
Uncorrected astigmatism, even as low as 1.00 D, caused significantly decreased vision and if left uncorrected could significantly affect patients' independence, quality of life, and well-being.
研究未矫正的远视散光对老年人的影响。
大学视力诊所。
研究性模拟。
健康的成人远视患者使用眼镜镜片诱导出 0.00 至-4.00 屈光度柱镜（DC）×90 度和-3.00 DC×90、×180 和×45 度，平均等效球镜补偿至平光，以随机顺序。使用计算机测试图表评估双眼视力，对比度分别为 95%、50%和 10%。使用标准化阅读文本测量近视力和阅读速度。使用 C-Quant 散光仪定量评估光散射，使用计算机模拟器评估驾驶反应时间。主观评价手机和电脑屏幕的视觉清晰度。
21 名志愿者的远距视力随着未矫正散光量的增加而下降（F=174.50，P<.001），随着对比度的降低而下降（F=170.77，P<.001）。近视力和阅读速度也随未矫正散光量的增加而降低（P<.001）。光散射不受未矫正散光的显著影响（P>.05）；然而，随着未矫正散光量的增加，测量的可靠性和可变性降低（P<.05）。驾驶模拟器性能不受未矫正散光的影响（P>.05），尽管清晰度的主观评价随着未矫正散光量的增加而降低（P<.001）。45 度或 180 度方向的未矫正散光导致远距和近距视力以及主观清晰度比 90 度方向差（P<.05）。
即使是 1.00 D 的未矫正散光也会导致视力显著下降，如果不进行矫正，可能会显著影响患者的独立性、生活质量和幸福感。
