PMID: 15252353Jul 15, 2004Paper

Corneal and lenticular components of total astigmatism in a preschool sample

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Sunita Shankar, William R Bobier

Abstract

To examine the contribution of corneal and lenticular components to total astigmatism in preschool low and high astigmats to determine whether there was any compensation for high astigmatism by the lenticular component. Cycloplegic refractive and keratometric measures using the Retinomax K-Plus (Nikon Inc., Melville, NY) were conducted on 129 children (mean age, 51.1 +/- 8.4 mo) in Oxford County, Canada. We divided the sample into high astigmats (total cylinder > or =1 D; mean, 1.38 +/- 0.43 D; n = 29) and normal astigmats (total cylinder < or =0.75 D; mean, 0.22 +/- 0.20 D; n = 100). Measures of total and corneal cylinder were transposed into J0 and J45 components, where positive and negative J0 values quantified with-the-rule (WTR) and against-the-rule astigmatisms, respectively, and J45 quantified oblique astigmatism. WTR astigmatism was dominant in both the high and normal astigmatic group. J0 and J45 components of corneal astigmatism were highly correlated with total astigmatism in high astigmats, whereas only J0 was significantly correlated with total astigmatism in normal astigmats. Although the magnitude of total and corneal cylinder was significantly greater in high astigmats, overall lenticular cylinder was similar in...Continue Reading

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Citations

Aug 30, 2011·Ophthalmology·Bradley V DavittUNKNOWN Early Treatment for Retinopathy of Prematurity Cooperative Group
May 11, 2010·Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus·Yu-Hung LaiShun-Jen Chang
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Sep 11, 2009·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Laura RemónWalter D Furlan
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Oct 1, 2013·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Tsz-wing LeungChea-su Kee
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