April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
Lens Power in an Adult Population: The Los Angeles Latino Eye Study
Author Affiliations & Notes
  • G. Iribarren
    Ophthalmology, Centro Médico San Luis, Buenos Aires, Argentina
  • R. Iribarren
    Ophthalmology, Centro Médico San Luis, Buenos Aires, Argentina
  • M. Torres
    Ophthalmology, University of Southern California, Los Angeles, California
  • I. G. Morgan
    ARC Ctr of Excellence in Vis Sci, Australian National University, Canberra, Australia
  • F. Choudhury
    Ophthalmology, University of Southern California, Los Angeles, California
  • R. Varma
    Ophthalmology, University of Southern California, Los Angeles, California
  • Footnotes
    Commercial Relationships  G. Iribarren, None; R. Iribarren, None; M. Torres, None; I.G. Morgan, None; F. Choudhury, None; R. Varma, None.
  • Footnotes
    Support  MT, FCh, RV, NEI EY 11753, - IGM's contribution was supported by a grant from the ARC Centre of Excellence in Vision Science
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 1717. doi:https://doi.org/
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      G. Iribarren, R. Iribarren, M. Torres, I. G. Morgan, F. Choudhury, R. Varma; Lens Power in an Adult Population: The Los Angeles Latino Eye Study. Invest. Ophthalmol. Vis. Sci. 2010;51(13):1717. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To study the crystalline lens power in older adults without cataract in relation to refractive error.

Methods: : A subset of participants from a population-based study, the Los Angeles Latino Eye Study, consisting of only those aged 61-70 years with nuclear opacity grading 0 and I (i.e.: without clinical cataract) was studied. This selection was performed to concentrate on persons after age-related hyperopic shifts had occurred, but before there were myopic shifts associated with nuclear cataract. The ocular components were measured by A-scan and the lens power was calculated with Bennett’s formula. The correlation coefficients between the components of refraction and mean values for each ocular component were determined for three refractive groups. Myopes were participants with spherical equivalent < -0.50 diopters, hyperopes were those with spherical equivalent > +1.00 diopters and the rest were considered emmetropes.

Results: : There were 452 participants in the 61-70 age range with nuclear opacity grading of 0 and 1. Men comprised 39.8%. Refractive groups differed in axial length and anterior chamber depth, but not in corneal power. Lens thickness was significantly lower in myopes when compared to emmetropes (4.35 +/- 0.39 mm vs. 4.50 +/- 0.49 mm, p = 0.048). There were negative correlations between calculated lens power and axial length (r = -0.531, p < 0.001), and between lens power and refractive error (r = -0.080, p =0.08). This produces a paradox, because less powerful lenses were associated simultaneously with longer eyes and with more hyperopic refractions. The mean lens power was lower in hyperopes when compared to emmetropes (23.27 +/- 2.02 diopters vs. 23.94 +/- 2.24 diopters respectively, p = 0.013).

Conclusions: : These results confirm the existence of a paradox first noted by Olsen et al. (Acta Ophth Scan 2007;85:361-6) of negative correlations of lens power with axial length and refractive error. This is explained because hyperopic eyes have lower lens power than emmetropes.

Keywords: refractive error development • aging • refraction 
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