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A.A. Martinez, P. Sankaridurg, D. Sweeney, K. Rose, P. Mitchell; Monochromatic Ocular Aberrations in Australian Children, the Sydney Myopia Study . Invest. Ophthalmol. Vis. Sci. 2006;47(13):1177.
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To assess ocular aberrations and differences if any, in the aberration profile between refractive error groups of eyes of Australian children in the Sydney Myopia Study.
In this study, refractive error and ocular aberrations in a sub–sample of high school children (year 7, mostly aged 12 years) were obtained using a S–H aberrometer. Cycloplegic data from right eyes (PD>5mm) were analysed. Refractive error was defined as myopia for spherical equivalent (SE) <–0.50D, emmetropia for SE –0.50D to 0.50D and hyperopia for SE>0.50D. Eyes with astigmatism >1.00D were excluded. Monochromatic aberrations from second through sixth order were analyzed. Differences between groups were analyzed using multiple comparisons Tukey HSD, with significance set at p<0.05.
A total of 831 children with a mean age 12.6± 0.5 years (range 11.1 to 14.4) were examined. The dominant aberration across the subjects was Z2,0 followed by Z2,2 (Fig 1). Of the higher order aberrations, fifth and sixth order aberrations were small in magnitude. Significant differences were seen between the groups for Z3,–1 which was 0.04 ± 0.11 µm, 0.0004 ± 0.09 µm, –0.0004 ± 0.1 µm; and for Z4,0 which was 0.042 ± 0.06 µm, 0.044 ± 0.05 µm, 0.08 ± 0.06 µm for myopic, emmetropic and hyperopic children, respectively.
The study establishes normative data for ocular aberrations for a population–based sample of 12–year old schoolchildren in Sydney, Australia. Of the ocular aberrations, low order aberrations were the dominant across the groups. Higher order aberrations were small in magnitude with differences seen between the refractive error groups for some third and fourth order aberrations. Considerable inter–subject variability in aberrations was seen and the role, if any, played by higher order aberrations in the development of myopia is unclear.
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