May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Changes in human aberrations with accommodation as a function of age
Author Affiliations & Notes
  • N. Lopez–Gil
    Fisica,
    Universidad de Murcia, Murcia, Spain
  • R. Legras
    Laboratoire Aimé Cotton, Université Paris Sud, Paris, France
  • F. Lara
    Oftalmología,
    Universidad de Murcia, Murcia, Spain
  • V. Fernandez–Sanchez
    Oftalmología,
    Universidad de Murcia, Murcia, Spain
  • M.E. Ponce
    Murcia, Spain
  • Footnotes
    Commercial Relationships  N. Lopez–Gil, None; R. Legras, None; F. Lara, None; V. Fernandez–Sanchez, None; M.E. Ponce, None.
  • Footnotes
    Support  Fundación Séneca, Murcia, Spain, Grant: PI–42/00775/FS/01
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 1075. doi:
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      N. Lopez–Gil, R. Legras, F. Lara, V. Fernandez–Sanchez, M.E. Ponce; Changes in human aberrations with accommodation as a function of age . Invest. Ophthalmol. Vis. Sci. 2004;45(13):1075.

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Abstract

Abstract: : Purpose: It is already known that accommodation results in variations of low and high–order ocular aberrations. Our purpose was to study these dynamic aberrations changes in subjects of different ages. Methods: We selected 40 subjects distributed into four age groups: A (20–30 years), B (30–40), C(40–50) and D (50–60). Wavefront assessments were performed using an Imagine Eyes Irx3 aberrometer, which allowed a dynamic control of the fixation target vergence during measurements. For each eye, ocular aberrations were first obtained in the unaccommodated state. In a second procedure, wavefront errors were measured under a ramp stimulation of accommodation from 0 to 5D. All wavefront data were fitted to Zernike expansions with coefficients normalized to a standard 4mm pupil diameter. Results: Significant changes in aberration coefficients with stimulus vergence were found in all age groups, including groups C and D where the focus response was weak. In particular, the spherical aberration response appeared to vary significantly with age: in average, the spherical aberration coefficient systematically decreased with increasing accommodation at young age, reaching zero for a stimulation around 3D; the same coefficient was found to increase under the same increasing stimulation conditions in the older age group (average increase 0.03µm over 4mm pupil). Conclusions: The age–related changes in the flexibility of the human lens do not only decrease accommodation amplitude but also modify the response of others aberrations, especially spherical aberration, to accommodation stimulation. These results can help to build a more realistic age–related model of the accommodation mechanism.

Keywords: aging: visual performance 
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