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Refractive and dimensional development of the crystalline lens in childhood

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Abstract

Classical models of emmetropization involve axial length increases accompanied by compensatory, coordinated decreases in crystalline lens power. The underlying mechanisms of this coordination are as yet unclear. We have begun the Orinda Longitudinal Study of Myopia to evaluate the development of the ocular components of refraction in schoolchildren, measuring cycloplegic refraction (Canon R-1 autorefractor), corneal curvature (photokeratoscope), axial dimensions (Humphrey model 820 ultrasound), and crystalline lens curvatures (video-based comparison Ophthalmophakometer). Initial cross sectional results on 240 children, 82 first (mean age 6.6 years), 92 third (8.5 years), and 66 sixth graders (11.6 years) indicate that the crystalline lens thins during development as its curvatures flatten. The mean lens thickness values (±s.d.) for the three groups respectively are: 3.58 ± 0.15 mm, 3.46 ± 0.16 mm, and 3.44 ± 0.13 mm. Adjusted multiple regression y-intercepts for refractive index are 1.417, 1.354, and 1.357 for the three age groups.

© 1991 Optical Society of America

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