Associations of Birth Weight With Ocular Biometry, Refraction, and Glaucomatous Endophenotypes: The Australian Twins Eye Study

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• 作者：Cong Sun ; Anne-Louise Ponsonby ; Shayne A. Brown ; Lisa S. Kearns ; Jane R. MacKinnon ; Julie M. Barbour ; Jonathan B. Ruddle ; Alex W. Hewitt ; Margret J. Wright ; Nicholas G. Martin ; Terence Dwyer ; David A.
• 刊名：American Journal of Ophthalmology
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：150
• 期：6
• 页码：909-916.e3
• 全文大小：1043 K

文摘

Purpose

To examine the relationship of birth weight with ocular measures in a Caucasian twin population.

Design

Cross-sectional study of 1498 twins (308 monozygotic and 441 dizygotic pairs) aged between 5 to 80 years participating in the Australian Twins Eye Study.

Methods

All participants underwent ophthalmic examination including bilateral cycloplegic autorefraction, keratometry, interpupillary distance (IPD), central corneal thickness, intraocular pressure (IOP), and retinal photography. Birth weight and gestation were obtained from a self-administered questionnaire. A subset of the twins also participated in the Tasmanian Infant Health Study (288) and the Childhood Blood Pressure Study (184), which collected data on birth parameters allowing for verification of data. Linear mixed models were used for the main analysis.

Results

Both the within-pair (β_w 0.27, 95 % confidence interval [CI] 0.15, 0.38 mm per kg increase in birth weight, P < .001) and between-pair associations (β_B 0.22, 95 % CI 0.08, 0.35, P = .002) of birth weight with axial length were significant and of similar magnitude (difference in effect, P = .56), after adjusting for relevant confounders. In contrast, birth weight was negatively associated with corneal curvature (β_w −0.82, 95 % CI −1.09, −0.55 diopters per kg increase; β_B −0.69, 95 % CI −0.98, −0.41, both P < .001). These associations remained significant within dizygotic and monozygotic pairs. Refraction, anterior chamber depth, IPD, IOP, and optic disc parameters are unrelated to birth weight.

Conclusions

Consistent with previous studies in singleton children, lower birth weight is associated with shorter axial length and more curved corneas in this twin study. This also adds new insights into the emmetropization process.