Abstract

Image formation by the human visual system depends specifically on the curvatures and refractive indices of the cornea and crystalline lens, as well as on the spacings between refractive surfaces within the system. For the adult emmetropic human eye, many of these spacings and curvatures appear to be confined to rather narrow ranges of magnitude (Koretz et al.,1989; Cook et al., 1994). These ranges are either age-independent (e.g., globe length) or linearly dependent on age (e.g., anterior chamber depth). In addition, the dependence of many of these spacings on accommodative amplitude (e.g., change in lens thickness per diopter of accommodation) is both linear and age-independent (Koretz et al., 1997). Taken together, these relationships with age and accommodative amplitude indicate a dynamic balance that leads to focus on the retina over the majority of an emmetropes lifetime (Koretz et al., 1995; Bron et al., 1999).

© 2000 Optical Society of America

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