眼睛的字母对比度敏感度函数。
Letter contrast sensitivity function of the eye.
作者信息
Liou H L, Brennan N A
机构信息
Department of Optometry and Vision Sciences, University of Melbourne, Parkville, VIC, Australia.
出版信息
Acta Ophthalmol Scand. 1998 Jun;76(3):325-8. doi: 10.1034/j.1600-0420.1998.760314.x.
PURPOSE
To provide empirical data of letter CSF for various levels of defocus under controlled conditions of luminance and age.
METHODS
Corrected distance visual acuities were tested at different levels of contrast and defocus. An experiment was conducted using the Medmont visual acuity tester on 10 young subjects and under normal room lighting.
RESULTS
Empirical data of visual acuity were obtained for 7 levels of contrast (5, 10, 15, 25, 40, 60, 80%) and defocus levels of 0, +1 and +2D. A mathematical model was derived (R2=0.995) and this can be used to estimate visual acuity at various contrast levels for defocus of < or =+2D.
CONCLUSION
This information is useful for the clinician as normative data and for further development of optical models to predict visual performance of the eye.
目的
在亮度和年龄可控的条件下，提供不同离焦水平下字母视标视力（letter CSF）的实验数据。
方法
在不同对比度和离焦水平下测试矫正远视力。使用Medmont视力测试仪，在10名年轻受试者身上，于正常室内照明条件下进行了一项实验。
结果
获得了7种对比度水平（5%、10%、15%、25%、40%、60%、80%）和0、+1及+2D离焦水平下的视力实验数据。推导了一个数学模型（R2 = 0.995），该模型可用于估计离焦小于或等于+2D时不同对比度水平下的视力。
结论
这些信息作为标准数据对临床医生有用，并且有助于光学模型的进一步发展，以预测眼睛的视觉性能。
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