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

PDF Article
More Like This
Development and Aging of Human Visual Focusing Mechanisms

Jane F. Koretz
NW7 Vision Science and its Applications (VSIA) 2000

Anterior segment 3-D geometry in normal and myopic guinea pig eyes

Susana Marcos, Pablo Pérez-Merino, Miriam Velasco-Ocana, Eduardo Martinez-Enriquez, Luis Revuelta, and Sally McFadden
FW5A.4 Frontiers in Optics (FiO) 2016


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription