Objective line spread function measurements, Snellen acuity, and LOCS II classification in patients with cataract.
We tested an instrument to measure the line spread function (LSF) of the eye in order to assess objectively retinal image degradation due to cataract. Optical aberrations from 62 eyes with early to moderate cataract were assessed by measuring the extent of blurring of a best-focused fine line image (LSF) projected onto a subject's retina. The instrument consisted of a slitlamp equipped with a Hruby lens to project the line and a computer-coupled CCD camera to record and measure the blurred image. We hypothesized that the width of the blurred line image (called WSCAT) due to light scattering in the cataractous lens would be affected most by nuclear and subcapsular cataracts. The WSCAT results were compared to the data from two other tests: (1) Snellen acuity and (2) LOCS II cataract classification. Grouping eyes by Snellen acuity we found that WSCAT from the group with 6/4.5 (20/15) or 6/6 (20/20) acuity was distinguishable from the group with 6/9 (20/30) or worse acuity (95% confidence interval). Data also were analyzed using a regression model which corrects for the intraclass correlation between the two eyes of an individual. Results show a significant association between WSCAT and minimum angular resolution (MAR) derived from Snellen visual acuity (regression coefficient of 5.45, p = 0.008). WSCAT also is correlated with both LOCS II nuclear opalescence (NO) and posterior subcapsular (P) categories with regression coefficients of 3.03 (p = 0.004) and 2.07 (p = 0.054), respectively. Results from measurement of LSF indicate the potential for this instrument to assess retinal image degradation associated with nuclear and posterior subcapsular cataract objectively.
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n. 触须；闻的人；鼻子
n. (Snellen)人名；(荷)斯内伦
...度（1为最清楚，10为极度迷蒙），L则是对象身处位置光度（1为伸手不见五指，150为正常室内光线），V代表本身的斯内伦（Snellen）视力敏锐度（6/6为正常，6/12为仅能驾车的视力），D是跟对象距离，将这些因素代入方程式内，就可算出 “啤酒眼镜”效应影响有多大...
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也可在其前边或侧面作业，1860年斯涅伦（Snellen）发明了标准视力表，又解除了框架眼镜带来的不便，仍然离得很近。 美国卡杜巴。
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...析 人眼能分辨出两点间最小距离是的视角是1′视角，其为外界物体两个端点与眼结点间的延线在眼前形成的夹角 。 斯耐仑（Snellen）最初设计的视力表原材料商情，是以5倍的1′视角作为视标的周边范围尺寸，而目前使用的各种视力表，其设计原理就是以此为基础 。
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史奈伦（Snellen）的E字母视力表创于一八六二年，乃利用相等视角的原理，以不同距离所相对应的字母大小依序排列，例如受检者在二十英尺的测试距离可...
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斯耐伦字母
斯内伦试验
斯内伦视力表
斯耐伦视觉图片
视力检查表
斯涅伦小数
斯涅伦小数(表示视力的数值)
斯内伦反射
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Dutch ophthalmologist who introduced the Snellen chart to study visual acuity ()
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Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.
视觉的敏锐程度，尤指经斯纳仑氏图表所测结果。在斯纳仑氏图表上测得的一般的视觉敏锐度为20/20。
Can you read the numbers on that line… -If a Snellen chart is not available, test visual acuity by using a special hand-held eye card.
你能够读出在哪行的数字吗…-如果斯内伦视力表不可以使用的话，测试视力通常是使用一种特殊的手持视力卡。
Astronomers Ignas Snellen of Leiden Observatory in the Netherlands and colleagues have now demonstrated that such optical observations are feasible.
现在，荷兰莱顿天文台的天文学家伊格纳斯·斯奈伦及同事证明了这样的光学观测是可行的。
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感谢您的反馈，我们会尽快进行适当修改！A comparison of Snellen, Landolt-C, and grating acuity at near and far distances - ScienceDirect
Export JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page., May 1984, Pages 239-240A comparison of Snellen, Landolt-C, and grating acuity at near and far distancesAuthor links open overlay panelShow moreCheck if you have access through your login credentials or your institution.ororRecommended articlesCiting articles (0)}