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Effect of third-order aberrations on dynamic accommodation.

Norberto López-Gil1, Frances J Rucker, Lawrence R Stark

  • 1Departamento de Física, Universidad de Murcia, Spain. norberto@um.es

Vision Research
|February 7, 2007
PubMed
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Third-order aberrations like coma and trefoil do not significantly impact the eye's accommodation response. This study found minimal effect of these aberrations on accommodative gain in visually normal individuals.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Optical Engineering

Background:

  • Accommodation is the eye's ability to change focus.
  • Third-order aberrations, such as coma and trefoil, can affect image quality.
  • The role of these aberrations in dynamic accommodation is not fully understood.

Purpose of the Study:

  • To investigate if third-order aberrations (coma and trefoil) provide a signed cue for accommodation.
  • To determine the influence of these aberrations on the dynamics of the accommodative response.

Main Methods:

  • Theoretical analysis of the point spread function in the presence of aberrations.
  • Experimental measurements of accommodative response using a dynamic infrared optometer.
  • Testing visually normal subjects with and without custom contact lenses inducing specific levels of trefoil and coma.

Related Experiment Videos

Main Results:

  • Theoretical models suggested insensitivity of the point spread function to the sign of spherical defocus with odd-order aberrations.
  • Experimental results showed no statistically significant effect on accommodative gain at low aberration levels.
  • High levels of trefoil and coma showed effects that approached or reached statistical significance.

Conclusions:

  • Third-order aberrations (coma and trefoil) do not appear to play a crucial role in the dynamics of the accommodation response.
  • The findings suggest that these aberrations are not primary drivers of accommodative control.
  • Further research may explore other aberration orders or different visual conditions.