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Induced defocus significantly increases light disturbance (LD) size, influenced by spherical high-order aberrations (HOAs), SAI, and SRI. Coma-like HOAs and SAI affect LD irregularity perception, impacting visual performance post-refractive surgery.

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Area of Science:

  • Ophthalmology and Optometry
  • Visual Optics
  • Corneal Physiology

Background:

  • Light disturbance (LD) perception is a critical factor in visual quality.
  • Understanding the influence of refractive errors and ocular aberrations on LD is essential for optimizing visual outcomes.
  • High-order aberrations (HOAs) and corneal topography significantly contribute to visual phenomena.

Purpose of the Study:

  • To assess the effect of positive and negative defocus on light disturbance (LD) measures.
  • To investigate the role of high-order aberrations (HOAs) and corneal topographic parameters in the perception of photic phenomena.
  • To determine the relationship between induced defocus and light distortion analyzer (LDA) metrics.

Main Methods:

  • A cross-sectional study involving 30 healthy subjects.
  • Light disturbance (LD) was measured using the light distortion analyzer (LDA) with induced 1.00D positive and negative defocus.
  • High-order aberrations (HOAs) and corneal morphological parameters (SAI, SRI, Q-value) were analyzed.

Main Results:

  • Induced defocus significantly increased LD size (p < 0.010) but not irregularity.
  • Spherical HOAs correlated with LD size, while coma-like and total HOAs correlated with LD irregularity.
  • SRI and SAI showed significant correlations with LD size and/or irregularity.

Conclusions:

  • Uncorrected refractive errors, spherical HOAs, SAI, and SRI may increase light disturbance size.
  • Coma-like HOAs, total HOAs, and SAI can influence the perception of LD irregularities.
  • Findings suggest potential implications for visual performance after refractive surgery.