Relationship between Refractive Error and Monochromatic Aberrations of the Eye
作者:
XU,
CHENG ARTHUR,
BRADLEY XIN,
HONG and LARRY,
期刊:
Optometry and Vision Science
(OVID Available online 2003)
卷期:
Volume 80,
issue 1
页码: 43-49
ISSN:1040-5488
年代: 2003
出版商: OVID
关键词: wavefront aberrations;myopia;refractive error
数据来源: OVID
摘要:
Purpose.To examine the relationship between ametropia and optical aberrations in a population of 200 normal human eyes with refractive errors spanning the range from +5.00 to −10.00 D.Methods.Using a reduced-eye model of ametropia, we tested the hypothesis that the optical system of the eye is uncorrelated with the degree of ametropia. These predictions were evaluated experimentally with a Shack-Hartmann aberrometer that measured the monochromatic aberrations across the central 6 mm of the dilated pupil in well-corrected, cyclopleged eyes.Results.Optical theory predicted, and control experiments on a model eye verified, that Shack-Hartmann measurements of spherical aberration will vary with axial elongation of the eye even if the dioptric components of the eye are fixed. Contrary to these predictions, spherical aberration was not significantly different from emmetropic eyes. Root mean square of third-order aberrations, fourth-order aberrations, and total higher aberrations (third to 10th) in myopic and hyperopic eyes were also uncorrelated with refractive error. Astigmatic eyes tended to have larger total higher-order aberrations than nonastigmatic eyes.Conclusions.We conclude that a reduced-eye model of myopia assuming fixed optical parameters and variable axial length is not tenable.
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