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Potential higher-order aberration cues for sphero-cylindrical refractive error development.

Tobias Buehren1, D Robert Iskander, Michael J Collins

  • 1Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia. tbuehren@yahoo.co.uk

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|April 17, 2007
PubMed
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Higher-order wavefront errors, including spherical aberration, coma, and trefoil, can signal the development of refractive errors like myopia and astigmatism. These aberrations may influence eye growth, leading to common vision problems.

Area of Science:

  • Ophthalmology and Vision Science
  • Optical Engineering
  • Computational Optics

Background:

  • Higher-order aberrations (HOAs) are deviations from perfect optics that affect visual quality.
  • Understanding the role of HOAs in refractive error development is crucial for vision science.
  • Common HOAs include spherical aberration, coma, and trefoil, which can interact and influence visual perception.

Purpose of the Study:

  • To analytically investigate if specific higher-order wavefront errors (trefoil30, vertical coma, spherical aberration) provide cues for the development of sphero-cylindrical refractive errors.
  • To determine the relationship between combinations of HOAs and the emergence of myopia and astigmatism.

Main Methods:

  • Created 25 test wavefronts with varying combinations and levels (0.1-0.5 µm HO-RMS) of spherical aberration, coma, and trefoil.

Related Experiment Videos

  • Generated refractive power maps and added 2025 sphero-cylindrical combinations to each map.
  • Calculated the visual Strehl ratio based on the modulation transfer function (VSMTF) for each combination.

    • Main Results:

    • Spherical aberration influenced the best focal plane, inducing spherical or defocus cues.
    • Vertical coma and trefoil30, combined with spherical aberration, showed improved VSMTF with various sphero-cylinders.
    • Clinically significant sphero-cylinders (≥0.25 D) were observed at HO-RMS levels of 0.2–0.3 µm for a 5-mm pupil.

    Conclusions:

    • Combinations of spherical aberration, coma, and trefoil aberrations can provide cues for eye growth.
    • These cues may contribute to the development of myopia and with-the-rule astigmatism.
    • The findings support the hypothesis of compensatory blur-driven eye growth in refractive error development.