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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 6 — Mar. 15, 1989
  • pp: 1097–1102

Accommodation and presbyopia in the human eye. 1: Evaluation of in vivo measurement techniques

Jane F. Koretz, Paul L. Kaufman, Michael W. Neider, and Patrick A. Goeckner  »View Author Affiliations


Applied Optics, Vol. 28, Issue 6, pp. 1097-1102 (1989)
http://dx.doi.org/10.1364/AO.28.001097


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Abstract

As part of a cross-sectional study of aging of the human accommodative apparatus, unaccommodated anterior chamber depth, unaccommodated lens thickness, and accommodative amplitude were each determined by two or more independent techniques in 100 normal emmetropic subjects, age 18–70 yr. For anterior chamber depth, the order of accuracy seemed to be: optical pachymetry > slit-lamp Scheimpflug photography > A-scan ultrasonography, although there was good agreement among all three methods. For lens thickness, slitlamp Scheimpflug photography seemed more accurate than A-scan ultrasonography when the generally accepted lenticular sound velocity of 1641 m • s−1 was used for the ultrasonographic calculation. The age-dependent divergence allowed calculation of a putative relationship between lenticular sound velocity and age, indicating that velocity decreased by ~3 m • s−1 • yr−1. Accommodative amplitude declined with age, reaching a minimum, by age 50 yr, of 0.5 diopters as measured by coincidence refractometry. This residual 0.5 diopters may represent the inherent focal depth of the eye’s optical system, rather than active accommodation. Maximum accommodative amplitude based on the subject’s ability to clearly visualize a target through minus lenses was always 1.50 diopters greater than the refractometrically measured maximum, regardless of age. This difference presumably represents increased depth of field provided by pupillary constriction, rather than active accommodation.

© 1989 Optical Society of America

History
Original Manuscript: June 6, 1988
Published: March 15, 1989

Citation
Jane F. Koretz, Paul L. Kaufman, Michael W. Neider, and Patrick A. Goeckner, "Accommodation and presbyopia in the human eye. 1: Evaluation of in vivo measurement techniques," Appl. Opt. 28, 1097-1102 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-6-1097


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