Wavefront aberration and its association with intraocular pressure and central corneal thickness in myopic eyes

Qu, Jia; Liu, Fan; Wu, Jiajun; Wang, Qinmei; Xu, Chenchen; Zhou, Xiangtian; He, Julian

doi:10.1016/j.jcrs.2007.04.012

Cited by 19 publications

(18 citation statements)

References 27 publications

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“…The relatively greater variation in ocular aberration than in corneal aberration infers that there is larger variability in internal aberrations contributed by the crystalline lens and ocular media, although this cohort only consisted of healthy myopic patients seeking refractive surgery. We compared the aberration values in this study with those in studies of Asian eyes and Caucasian eyes [13][14][15][16][17][18][19][20] (Table 2). To ensure the validity of these population comparisons, only studies in which wavefront measurements were obtained using Hartmann-Shack aberrometers were included to avoid wavefront differences linked to measurement technologies.…”

Section: Discussionmentioning

confidence: 99%

Ethnic differences in higher-order aberrations: Spherical aberration in the South East Asian Chinese eye

Lim¹,

Fam²

2009

Journal of Cataract and Refractive Surgery

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Section: Discussionmentioning

confidence: 99%

Ethnic differences in higher-order aberrations: Spherical aberration in the South East Asian Chinese eye

Lim¹,

Fam²

2009

Journal of Cataract and Refractive Surgery

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“…From the corneal heights, exported from the ATLAS system, wavefront aberrations for the anterior cornea were calculated using a customized MatLab ray-tracing program [18][19] to derive Zernike aberration terms up to the 7 th order (35 terms). The corneal height data were originally referenced to corneal vertex in the ATLAS system.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we have also tested a group of young myopes for comparison. Moreover, wavefront aberrations in the anterior corneal surface were examined using a precisely calibrated corneal topography system, 18,19 because the anterior cornea plays an important role in determining wavefront aberrations in the whole eye. 18,[20][21][22][23] …”

Section: Introductionmentioning

confidence: 99%

Higher-Order Wavefront Aberrations for Populations of Young Emmetropes and Myopes

Bao

et al. 2009

Journal of Optometry

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PURPOSE:To test the hypothesis that human eyes have a central tendency to be free of higher-order aberrations by analyzing wavefront aberrations for two young populations of respectively emmetropic and myopic subjects. METHODS: Both right and left eyes of 75 emmetropes and 196 myopes were measured for corneal wavefront aberration using a Humphrey corneal topographer and for the whole eye wavefront aberration using a WASCA wavefront sensor without pupil dilation. 35 Zernike aberration coefficients over a 6.0 mm pupil diameter were derived, and statistics of the higher-order terms (3 rd to 5 th orders) were tested. RESULTS: When signed Zernike aberrations of the right and left eyes were averaged together for the emmetropes, three higher-order modes (j=6, 12 and 13) were significantly different from zero in both the cornea and the whole eye (P<0.0005), and three additional terms (j=14, 15 and 17) were statistically non-zero for the whole eye. As the signs of y-axis asymmetrical terms in the left eye were flipped, three more terms in either the cornea (j=8, 18 and 19) or the whole eye (j=8, 10 and 20) became statistically non-zero. For the myopes, 8 corneal terms and 5 whole-eye terms were statistically non-zero when the two eyes were averaged together. As the signs flipped, the majority of the Zernike aberration terms were statistically different from zero. CONCLUSIONS: Human eyes have systematical higher order aberrations in population, and factors that cause bilateral symmetry of wavefront aberrations between the right and left eyes made important contribution to the systematical aberrations. (J Optom 2009;2:51-58 ©2009 Spanish Council of Optometry)

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“…For each corneal measurement, Zernike aberrations up to 7 th order (35 terms) were calculated using a customized MatLab ray-tracing program [8][9] from the height data exported from the ATLAS system. The data of corneal heights within a 4.5 mm corneal central area were calculated, and the Zernike aberrations in the whole eye within a 4.5 mm central pupil area were obtained by reprocessing the WASCA data.…”

Section: Discussionmentioning

confidence: 99%

“…For example, intraocular pressure was recently found to be related to vertical coma. 9 Studies on the effects of reading on corneal aberrations also revealed that the eye lid pressure could change the vertical coma as well as the trefoil. 13 Besides the coma aberration, weak but significant correlations were found for several other Zernike aberrations.…”

Section: Discussionmentioning

confidence: 99%

Association between Offset of the Pupil Center from the Corneal Vertex and Wavefront Aberration

Liu

et al. 2008

Journal of Optometry

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PURPOSE:To investigate the influence of offsets of the pupil center from the corneal vertex on wavefront aberrations in the anterior cornea and the whole eye. METHODS: Both right and left eyes of 103 subjects were measured for the wavefront aberrations in the anterior cornea, along with the offset of the pupil center relative to the corneal vertex, using a Humphrey corneal topographer, and for the wavefront aberration in the whole eye using a WASCA wavefront sensor. Correlations of the pupil center offsets with the Zernike aberrations were tested. RESULTS: X-axis shift of the pupil center from the corneal vertex was significantly correlated to horizontal coma for both the right (r = 0.54, P<0.0001) and left eyes (r=0.48, P<0.0001) in the cornea, but was weakly correlated to the coma in the whole eye (r=0.17, P=0.04 for OD; and r=0.17, P=0.05 for OS). Significant but weak correlations with the x-axis pupil center shift were also found for several other Zernike aberrations, including the oblique astigmatism, vertical trefoil and secondary astigmatism. Very few Zernike aberrations were significantly correlated to y-axis pupil center shift. Most Zernike aberrations were significantly correlated between the right and left eyes to produce bilateral symmetry in the cornea and the whole eye. CONCLUSIONS:The results suggest that offset of the pupil center from the corneal vertex plays an important role in determining horizontal coma and few other Zernike aberrations. Factors controlling bilateral symmetry of the wavefront aberrations between the two eyes could make important contributions to wavefront aberrations in the human eye. (J Optom 2008;1:8-13 ©2008 Spanish Council of Optometry) KEY WORDS: wavefront aberration; angle lambda; pupil center; corneal vertex; bilateral symmetry. RESUMEN OBJETIVO:Investigar el efecto que tiene el descentramiento de la pupila con respecto al vértice corneal sobre las aberraciones del frente onda asociadas tanto a la cara anterior de la córnea como a la totalidad del ojo. MÉTODOS: En los ojos derecho e izquierdo de 103 sujetos se midieron las aberraciones del frente de onda asociadas tanto a la cara anterior de la córnea (utilizando un topógrafo corneal Humphrey), como a la totalidad del ojo (utilizando un sensor de frente de onda WASCA). Asimismo, se midió el desplazamiento del centro de la pupila respecto a la posición del vértice corneal, utilizando el mismo topógrafo corneal Humphrey anteriormente mencionado. Se investigó la posible correlación entre el valor del desplazamiento del centro de la pupila y los distintos términos de aberraciones de Zernike. RESULTADOS: El desplazamiento según el eje x del centro de la pupila respecto al vértice corneal muestra una correlación significativa con el valor del coma horizontal en la córnea tanto para los ojos derechos (r=0,54; P<0,0001) como para los izquierdos (r=0,48; P<0,0001); sin embargo, existe una correlación muy débil entre el valor de este desplazamiento y el coma de toda la óptica ocular (r=0,17; P=0,04 para OD; y r=0,17; P...

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Wavefront aberration and its association with intraocular pressure and central corneal thickness in myopic eyes

Cited by 19 publications

References 27 publications

Ethnic differences in higher-order aberrations: Spherical aberration in the South East Asian Chinese eye

Ethnic differences in higher-order aberrations: Spherical aberration in the South East Asian Chinese eye

Higher-Order Wavefront Aberrations for Populations of Young Emmetropes and Myopes

Association between Offset of the Pupil Center from the Corneal Vertex and Wavefront Aberration

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