A SIMPLE PARAMETRIC MODEL OF THE HUMAN OCULAR MODULATION TRANSFER-FUNCTION

被引：37

作者：

DEELEY, RJ

DRASDO, N

CHARMAN, WN

机构：

[1] Department of Vision Sciences, Asian University, Birmingham, B4 7ET, Aston Triangle

[2] Department of Optometry and Vision Sciences, UMIST, Manchester

来源：

OPHTHALMIC AND PHYSIOLOGICAL OPTICS | 1991年 / 11卷 / 01期

关键词：

D O I：

10.1111/j.1475-1313.1991.tb00200.x

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

The ocular modulation transfer function (MTF) has an important role in many investigations into human vision. It can be approximated by the equation MT = exp[ - (SF/SFc)n], where MT, SF, SF(c) and n are the modulation transfer, spatial frequency, frequency constant and MTF index respectively. In a theoretical study, the parameters n and SF(c) were determined by a mathematical method from previously published data. A general equation was deduced expressing the MTF as a function of pupil size for diameters of 1.5-7.5 mm. For pupil diameters below 1.5 mm different equations providing MTFs as a function of pupil diameter have been produced. These are based on the assumption that for these pupil diameters diffraction and retinal scatter determine the optical degradation. The use of these models is described in studies on spatial vision, where they have widespread applications and the effects of optical degradation are frequently neglected.

引用

页码：91 / 93

页数：3

共 23 条

[1]

Campbell F.W., Gubisch R.W., Optical quality of the human eye, J. Physiol. Lond., 186, pp. 558-578, (1966)

[2]

Charman W.N., The retinal image in the human eye, Progress in Retinal Research, 2, pp. 1-50, (1983)

[3]

Deeley R.J., Drasdo N., The effect of optical degradation on the contrast sensitivity function measured at the fovea and in the periphery, Vision Res., 27, pp. 1179-1186, (1987)

[4]

Drasdo N., Thompson D.A., Thompson C.M., Edwards L., Complementary components and local variations of the pattern electroroetinogram, Invest. Ophthalmol. Vision Sci., 28, pp. 158-162, (1987)

[5]

Campbell F.W., Green D.G., Optical and retinal factors affecting visual resolution, J. Physiol. Lond., 181, pp. 576-593, (1965)

[6]

Drasdo N., Cox W., Local luminance effects of degraded pattern stimulation, Clin. Vision Sci., 1, pp. 317-325, (1987)

[7]

Van Meeteren A., Calculations on the optical modulation transfer function of the human eye for while light, Optica Acta., 21, pp. 1097-1103, (1974)

[8]

Pry G.A., The optical performance of the human eye, Progress in Optics, 8, pp. 53-131, (1970)

[9]

Fischer B., Optische und Neuronale Grundlagen der visuellen Bildubertragung

[10]

Einheitliche mathematische Behandlung des retinalen Bildes und der Erregbarkeit von retinalen Ganglienzellen mit Hilfe der Linearen Systemtheorie. Systemtheorie, Vision Res., 12, pp. 1125-1144, (1972)

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