title: Corneal Power, Anterior Segment Length and Lens Power in 14-year-old Chinese Children: the Anyang Childhood Eye Study.
abstract: To analyze the components of young Chinese eyes with special attention to differences in corneal power, anterior segment length and lens power. Cycloplegic refractions and ocular biometry with LENSTAR were used to calculate lens power with Bennett's method. Mean refraction and mean values for the ocular components of five different refractive groups were studied with ANOVA and post-hoc Scheffé tests. There were 1889 subjects included with full data of refraction and ocular components. As expected, mean axial length was significantly longer in myopic eyes compared to emmetropes. Girls had steeper corneas, more powerful lenses and shorter eyes than boys. Lens power was lower in boys and also lower in myopic eyes. Lens thickness was the same for both genders but was lower in myopic eyes. Although cornea was steeper in myopic eyes in the whole sample, this was a gender effect (more girls in the myopic group) as this difference disappeared when the analysis was split by gender. Anterior segment length was longer in myopic eyes. In conclusion, myopic eyes have lower lens power and longer anterior segment length, that partially compensate their longer axial length. When analyzed by gender, the corneal power is not greater in low and moderate myopic eyes.
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Shi-Ming
authors.initials: SM
authors.lastname: Li
authors.affiliation: Department of Ophthalmology, San Luis Medical Center, Buenos Aires, Argentina.
authors.forename: Rafael
authors.initials: R
authors.lastname: Iribarren
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Meng-Tian
authors.initials: MT
authors.lastname: Kang
authors.affiliation: Anyang Eye Hospital, Henan Province, China.
authors.forename: He
authors.initials: H
authors.lastname: Li
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Si-Yuan
authors.initials: SY
authors.lastname: Li
authors.affiliation: Anyang Eye Hospital, Henan Province, China.
authors.forename: Luo-Ru
authors.initials: LR
authors.lastname: Liu
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Yun-Yun
authors.initials: YY
authors.lastname: Sun
authors.affiliation: Department of Epidemiology and Health Statistics, Peking University School of Public Health, Beijing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Meng
authors.affiliation: Department of Epidemiology and Health Statistics, Peking University School of Public Health, Beijing, China.
authors.forename: Si-Yan
authors.initials: SY
authors.lastname: Zhan
authors.affiliation: Department of Ophthalmology, Antwerp University Hospital, Edegem, Belgium.|Department of Medicine and Health Sciences, Antwerp University, Wilrijk, Belgium.
authors.forename: Jos J
authors.initials: JJ
authors.lastname: Rozema
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Ningli
authors.initials: N
authors.lastname: Wang
mesh_terms: D000869:Anterior Eye Segment / Q000033:anatomy & histology*; D003315:Cornea / Q000502:physiology*; D058453:Emmetropia; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000502:physiology*; D008297:Male; D009216:Myopia / Q000453:epidemiology; D009799:Ocular Physiological Phenomena; D062486:Public Health Surveillance; D012029:Refraction, Ocular
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