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Crystalline lens parameters in infancy
Author(s) -
Wood Ivan C. J.,
Mutti Donald O.,
Zadnik Karla
Publication year - 1996
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1996.96833692.x
Subject(s) - retinoscopy , lens (geology) , refractive error , refractive index , vitreous chamber , radius of curvature , optics , flattening , radius , ophthalmology , optical power , optometry , curvature , medicine , mathematics , materials science , physics , eye disease , geometry , mean curvature , laser , computer security , mean curvature flow , computer science , composite material
Despite the importance of lens power to ocular development, few data are available regarding infant crystalline lens parameters. Lens and corneal curvatures were measured using a video‐based keratophakometer, and refractive error was measured by cycloplegic retinoscopy in 19 out of 27 infants ranging in age from 3 to 18 months. The median spherical equivalent refractive error was +1.00 D, and the median corneal power was 43.3 D. Using previously reported values for axial ocular dimensions, the median anterior and posterior lens radii of curvature were 8.8 mm and 5.7 mm, respectively, both substantially flatter than infant schematic eye values. The median equivalent refractive index of the lens was 1.50. There were no age‐related trends in lens radii, refractive error, or corneal radius, suggesting that calculated values for lens power and equivalent index may undergo substantial decline with age. Most of the decrease in lens power (79%) appeared to be due to decreases in equivalent index rather than to flattening of the surface curvatures. Phakometry appears to be a feasible and useful technique for documenting the role of the crystalline lens in infant ocular development.