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Erin M. Harvey, Velma Dobson, Joseph M. Miller, Jim Schwiegerling, Candice E. Clifford-Donaldson, Tina K. Green, Dawn H. Messer; Prevalence of Corneal Astigmatism in Tohono O'odham Native American Children 6 Months to 8 Years of Age. Invest. Ophthalmol. Vis. Sci. 2011;52(7):4350-4355. doi: 10.1167/iovs.10-6061.
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© ARVO (1962-2015); The Authors (2016-present)
To describe the prevalence of corneal astigmatism in infants and young children who are members of a Native American tribe with a high prevalence of refractive astigmatism.
The prevalence of corneal astigmatism was assessed by obtaining infant keratometer (IK4) measurements from 1235 Tohono O'odham children, aged 6 months to 8 years.
The prevalence of corneal astigmatism >2.00 D was lower in the 1- to <2-year-old age group when compared with all other age groups, except the 6- to <7-year-old group. The magnitude of mean corneal astigmatism was significantly lower in the 1- to <2-year age group than in the 5- to <6-, 6- to <7-, and 7- to <8-year age groups. Corneal astigmatism was with-the-rule (WTR) in 91.4% of astigmatic children (≥1.00 D).
The prevalence and mean amount of corneal astigmatism were higher than reported in non–Native American populations. Mean astigmatism increased from 1.43 D in 1-year-olds to nearly 2.00 D by school age.
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