Age-related paraxial schematic emmetropic eyes.

Based on recent biometric data, four-surface paraxial schematic emmetropic eyes for different ages have been developed. There are three sets of schematic eyes: male, female and overall. With increase in age, the changes in the schematic eyes are decreased anterior chamber depth, increased lens thickness, decreased vitreous length, increased axial length, decreased anterior lens radius of curvature and increased lens equivalent refractive index. Gender differences are greater anterior corneal radii of curvature (0.07 mm), longer vitreous chambers (0.70 mm), longer axial length (0.70 mm) and lower lens equivalent refractive indices of male eyes (0.007) relative to female eyes. Gaussian parameters of the various schematic eyes are given.