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Related Experiment Videos

Higher order aberrations across the horizontal visual field.

David A Atchison1

  • 1Queensland University of Technology, Visual and Opthalmic Optics Group, School of Optometry, Kelvin Grove, Australia. d.atchison@qut.edu.au

Journal of Biomedical Optics
|July 11, 2006
PubMed
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Higher order aberrations like coma and spherical aberration change with visual field position in both normal and LASIK eyes. Corneal asphericity significantly impacts coma

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Science

Background:

  • Higher order aberrations impact visual quality.
  • Understanding their behavior across the visual field is crucial for refractive surgery outcomes.
  • Laser-assisted in situ keratomileusis (LASIK) can alter corneal shape and aberrations.

Purpose of the Study:

  • To investigate the relationship between higher order aberrations and horizontal visual field position.
  • To compare aberration profiles in untreated eyes versus eyes after myopic LASIK.
  • To determine the influence of corneal asphericity on these aberrations.

Main Methods:

  • Collected aberration coefficients from five untreated subjects and two myopic LASIK subjects.
  • Measured aberrations across the horizontal visual field (up to 40 degrees temporally and nasally).

Related Experiment Videos

  • Analyzed the influence of visual field position on horizontal coma, spherical aberration, and secondary astigmatism.

    • Main Results:

    • In untreated subjects, horizontal coma varied linearly, while spherical aberration and secondary astigmatism varied quadratically with visual field position.
    • In myopic LASIK subjects, horizontal coma had an opposite sign compared to untreated eyes, attributed to anterior corneal asphericity.
    • Spherical aberration and secondary astigmatism also showed quadratic positional dependence in LASIK eyes.
    • Corneal asphericity significantly influenced the rate and sign of change in horizontal coma.

    Conclusions:

    • Horizontal coma, spherical aberration, and secondary astigmatism exhibit systematic changes across the horizontal visual field.
    • Corneal asphericity plays a critical role in modulating horizontal coma in eyes after myopic LASIK.
    • These findings have implications for understanding visual field-dependent aberrations after refractive surgery.