IOVS British Journal of Pharmacology
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(Investigative Ophthalmology and Visual Science. 2002;43:2882-2886.)
© 2002 by The Association for Research in Vision and Ophthalmology, Inc.

Apparent Accommodation and Corneal Wavefront Aberration in Pseudophakic Eyes

Tetsuro Oshika1, Tatsuya Mimura2, Sumiyoshi Tanaka2, Shiro Amano2, Makoto Fukuyama3, Fumiaki Yoshitomi4, Naoyuki Maeda5, Takashi Fujikado5, Yoko Hirohara6 and Toshifumi Mihashi6

1 From the Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan; the 2 Department of Ophthalmology, University of Tokyo School of Medicine, Tokyo, Japan; the 3 Fukuyama Eye Clinic, Omuta, Fukuoka, Japan; the 4 Yoshitomi Eye Center, Dazaifu, Fukuoka, Japan; the 5 Department of Ophthalmology, Osaka University Medical School, Osaka, Japan; and the 6 Technical Research Institute, Topcon Corporation, Tokyo, Japan.

PURPOSE. To assess the relationship between apparent accommodation in pseudophakic eyes, multifocal corneal effects, and wavefront aberrations of the cornea.

METHODS. In 102 eyes of 86 patients who had undergone phacoemulsification and posterior chamber intraocular lens implantation, the amount of apparent accommodation was measured with an accommodometer. The degree of corneal multifocality was determined on the corneal topography by measuring the maximum and minimum corneal refractive powers within the pupillary area. Wavefront aberrations of the cornea were calculated by expanding the height data of the corneal topography into Zernike polynomials for individual pupil size. The influence of higher-order aberration on the retinal image quality was simulated by computing the point-spread function (PSF) and modulation-transfer function (MTF) from the aberration function.

RESULTS. There was a significant positive correlation between the amount of apparent accommodation and corneal multifocality (Pearson correlation coefficient, r = 0.451, P < 0.001). The coma-like aberration showed a significant positive correlation with the amount of apparent accommodation (r = 0.440, P < 0.001), but the spherical-like aberration did not (r = 0.001, P = 0.993). Among the coma-like aberrations, the component representing vertically asymmetrical distribution of corneal refractive power with greater refraction located in the lower part of the eye was most relevant to apparent accommodation. Computer simulation of PSF and MTF indicated that a focus shift of 0.5 D deteriorated the retinal image significantly more in eyes without higher-order aberrations than in eyes with a moderate amount of coma-like aberrations.

CONCLUSIONS. Coma-like aberration of the cornea, along with corneal multifocality, contributes to apparent accommodation in pseudophakic eyes.






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Copyright © 2002 by the Association for Research in Vision and Ophthalmology