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A population study on changes in wave aberrations with accommodation.

Han Cheng1, Justin K Barnett, Abhiram S Vilupuru

  • 1College of Optometry, University of Houston, Houston, TX 77204-2020, USA. hcheng@optometry.uh.edu

Journal of Vision
|May 12, 2004
PubMed
Summary
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Spherical aberration changes most with accommodation, decreasing as the eye focuses. Correcting wave aberrations for distance viewing benefits vision across all accommodative levels.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Wave aberrations impact visual quality.
  • Accommodation, the eye's ability to focus, changes with visual demand.
  • Understanding aberration changes during accommodation is crucial for vision correction.

Purpose of the Study:

  • To quantify changes in ocular wave aberrations during accommodation.
  • To determine which Zernike terms change most significantly with accommodative effort.
  • To assess the benefit of correcting aberrations for distance viewing across the accommodative range.

Main Methods:

  • Wave aberrations measured using Shack-Hartmann wavefront sensor (SHWS) in young adults.
  • Accommodative demands of 0, 3, and 6 D were applied via a Badal system.

Related Experiment Videos

  • Wave aberrations computed over a 5-mm pupil using Zernike polynomials up to 6th order.

    • Main Results:

    • Spherical aberration exhibited the largest change with accommodation, decreasing proportionally with accommodative response.
    • Coma and astigmatism also varied with accommodation, but with inconsistent directionality.
    • Root mean square of aberrations (excluding defocus) remained stable up to 3.0 D accommodation, despite individual variability.

    Conclusions:

    • Spherical aberration is the primary Zernike term affected by accommodation.
    • Aberration changes during accommodation are generally smaller than baseline uncorrected aberrations.
    • Correcting ocular aberrations for distance viewing is beneficial across the full 0-6 D accommodative range.