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

Lim, Kooi Ling; Fam, Han Bor

doi:10.1016/j.jcrs.2009.06.031

Cited by 34 publications

(23 citation statements)

References 29 publications

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“…Significant differences in the refractive error range of the examined populations of Brunette et al and Zhang et al may explain the inconsistency in their results, with −3.50 to +3.50 D (across all included ages from six to 82 years) and −10.00 to +8.25 D, respectively, although Zhang et al reported no significant differences in HOAs between the myopes, emmetropes and hyperopes within each age group. Additionally, Caucasian and Asian adults, and Chinese and Malay children, have been reported to exhibit HOA profile differences, particularly for primary spherical aberration (

Z_{4}^{0}

); therefore, ethnic variation may also exist between the HOA profiles of Canadian and Chinese children. Given the cross‐sectional designs of both studies, longitudinal studies are required to further the current understanding of the temporal variations in HOAs during childhood.…”

Section: Hoas and Agementioning

confidence: 99%

Higher order aberrations, refractive error development and myopia control: a review

Hughes

Vincent

Read

et al. 2020

Clinical and Experimental Optometry

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Evidence from animal and human studies suggests that ocular growth is influenced by visual experience. Reduced retinal image quality and imposed optical defocus result in predictable changes in axial eye growth. Higher order aberrations are optical imperfections of the eye that alter retinal image quality despite optimal correction of spherical defocus and astigmatism. Since higher order aberrations reduce retinal image quality and produce variations in optical vergence across the entrance pupil of the eye, they may provide optical signals that contribute to the regulation and modulation of eye growth and refractive error development. The magnitude and type of higher order aberrations vary with age, refractive error, and during near work and accommodation. Furthermore, distinctive changes in higher order aberrations occur with various myopia control treatments, including atropine, near addition spectacle lenses, orthokeratology and soft multifocal and dual‐focus contact lenses. Several plausible mechanisms have been proposed by which higher order aberrations may influence axial eye growth, the development of refractive error, and the treatment effect of myopia control interventions. Future studies of higher order aberrations, particularly during childhood, accommodation, and treatment with myopia control interventions are required to further our understanding of their potential role in refractive error development and eye growth.

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Z_{4}^{0}

Section: Hoas and Agementioning

confidence: 99%

Higher order aberrations, refractive error development and myopia control: a review

Hughes

Vincent

Read

et al. 2020

Clinical and Experimental Optometry

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“…Using the large population study by Salmon and van de Pol as the reference norm for HOAs in a healthy population [5], we found the similarities in the distribution of predominant aberrations but distinct differences in the magnitude of aberrations. For the corneal RMS-HOA, the normal United States people were 0.479±0.124 µm (KL & HB 2009); the Malaysia (ethnic Chinese) people were 0.591±0.256 µm [18]. RMS-HOAs of anterior corneal surface in our research were 0.598±0.125 µm, more than that of Caucasian.…”

Section: The Ethnic Characteristics Of Our Data Of Corneal Hoasmentioning

confidence: 49%

Cohort Study: Corneal Higher-Order Aberrations and Its Related Factors in Chinese People with Emmetropia

Song¹,

Yu²,

Du³

et al. 2011

J Clinic Experiment Ophthalmol

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HOAs, such as the distribution in the population and changes with increasing aging, are essential for understanding the nature of each aberration and correcting it. Hence, the purpose of this study were: firstly, to obtain information about characters of anterior and posterior corneal HOAs in the Asian eyes of Chinese people with emmetropia and to compare them with findings in other series in the literature; secondly, to determine their relationships with age, gender, CCT and ACD. Materials and Methods This study was designed as a prospective, randomized study and followed the tenets of the Declaration of Helsinki. Informed consent was obtained from each candidate. A total of 1026 eyes of 1206 candidates, 605 male (50.2%), 601 female (49.8%) were examined, only right eyes were considered. Corneal HOAs were computed from the central 6.0 mm zone of the corneal topographic maps. All Subjects came spontaneously for consultation and were subdivided into six age groups. The subjects were submitted

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“…To account for the reversed coma effect seen in our data (Figure 4D) we would need a Q value of approximately +0.55, as depicted by the open circles in Figure 5. With increasing anterior corneal asphericity, spherical aberration usually becomes more positive 42,43 . Therefore, we correlated the slope of horizontal coma with central spherical aberration.…”

Section: Resultsmentioning

confidence: 99%

Peripheral aberration measurements: elliptical pupil transformation and variations in horizontal coma across the visual field

Hartwig

Murray

Radhakrishnan

2011

Clinical and Experimental Optometry

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Background: The aim was to determine the critical eccentricity at which two methods of elaborating peripheral wavefront measurements are significantly different and to characterise horizontal coma in healthy young adults. Methods: Peripheral aberrations were determined for 20 observers for central and eight peripheral gaze positions up to 20° using an IRX‐3 aberrometer. In one subject, additional measurements up to 40° were obtained. Two definitions of stretching coefficients were compared. The raw empirical data were compared with theoretical modelling. Results: For both 3.5 mm and 6.0 mm pupils, no significant differences were observed between recalculated and non‐recalculated elliptical pupils for both methods (p > 0.05) up to 20° eccentricity. For eccentricities greater than 20° and up to 40°, significant differences between circular and elliptical pupils at some eccentricities were apparent, which corresponded to theoretical models. Wide individual variations in horizontal coma across the peripheral field were observed. Conclusions: The data suggest that for eyes with average levels of aberrations, the elliptical transformation is of no practical importance for eccentricities up to 20°. In some cases the slope of horizontal coma was reversed compared with previous findings in normal eyes.

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

Abstract: Corneal and ocular aberrations in South East Asian Chinese eyes were significantly greater than that reported in other populations. Population differences in wavefront errors were significant, and this should be noted in patient management.

Cited by 34 publications

References 29 publications

Higher order aberrations, refractive error development and myopia control: a review

Higher order aberrations, refractive error development and myopia control: a review

Cohort Study: Corneal Higher-Order Aberrations and Its Related Factors in Chinese People with Emmetropia

Peripheral aberration measurements: elliptical pupil transformation and variations in horizontal coma across the visual field

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