Publication: Diurnal variation of higher order aberrations in human eyes
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Issued Date
2007-05-01
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ISSN
1081597X
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2-s2.0-34248572941
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Refractive Surgery. Vol.23, No.5 (2007), 442-446
Suggested Citation
Sabong Srivannaboon, Dan Z. Reinstein, Timothy J. Archer Diurnal variation of higher order aberrations in human eyes. Journal of Refractive Surgery. Vol.23, No.5 (2007), 442-446. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/24907
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Title
Diurnal variation of higher order aberrations in human eyes
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Abstract
PURPOSE: To evaluate diumal variation of higher order aberrations in human eyes. METHODS: A prospective study of 20 myopic eyes was performed. Cycloplegic aberrometry (Zywave) and refraction were measured at 2-hour intervals for five time points beginning at 10:00 AM. Changes in measured magnitude for third and fourth order Zernike coefficients were compared over time. Analysis of variance (ANOVA) was performed to test for statistically significant differences across time points for each Zernike coefficient. A separate prospective study was performed of 11 myopic eyes to determine and compare diurnal variation with the repeatability coefficient of individual Zernike coefficients measured using the Zywave aberrometer. RESULTS: Mean refraction was -0.75±1.25 diopters (D) sphere and -0.57±0.43 D cylinder. No statistically significant change (ANOVA) was noted over the period of observation for any individual Zernike coefficients. Only Z3-3(vertical trefoil) showed an average increase of 0.029 μm (P=.98) towards the end of the day; however, this trend was not statistically significant. The standard deviation of individual Zernike coefficients ranged from 0.035 μm (Z44) to 0.165 μm (Z3-1). CONCLUSIONS: No statistically significant diurnal variation of higher order aberrations was measured by Zywave aberrometer. The trend of Z3-3increasing later in the day was most likely a Zywave measurement error artifact.