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Differences between wavefront and subjective refraction for infrared light.

Danielle F W Teel1, Robert J Jacobs, James Copland

  • 1*OD, PhD, FAAO †MSc(Optom), PhD, FAAO ‡BS §PhD ∥PhD, FAAO Indiana University School of Optometry, Bloomington, Indiana (DFWT, LNT); Department of Optometry, University of Auckland, Auckland, New Zealand (RJJ); and Wavefront Sciences, Inc, Albuquerque, New Mexico (JC, DRN).

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 23, 2014
PubMed
Summary
This summary is machine-generated.

Objective wavefront refractions using near-infrared light showed a myopic bias compared to subjective refractions. This bias was more pronounced in brown eyes, suggesting melanin

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Area of Science:

  • Ophthalmology and Vision Science
  • Optical Engineering
  • Biomedical Optics

Background:

  • Accurate refractive error measurement is crucial for vision correction.
  • Objective wavefront aberrometry offers a non-subjective method for assessing refractive error.
  • Near-infrared (NIR) light is used to avoid chromatic aberration but may introduce other biases.

Purpose of the Study:

  • To evaluate the accuracy of objective wavefront refractions in predicting subjective refractions.
  • To investigate the performance of objective measurements using monochromatic infrared light.
  • To compare different objective refraction metrics and their biases.

Main Methods:

  • Objective refractions were obtained using a commercial wavefront aberrometer (COAS).
  • Subjective refractions were measured using a speckle optometer.
  • Both instruments utilized near-infrared (NIR) radiation (835 nm and 820 nm) with a 3-mm artificial pupil.

Main Results:

  • Objective Zernike refractions were consistently more myopic than subjective refractions (-0.26 D mean bias).
  • Paraxial (Seidel) objective refractions showed a hyperopic bias (+0.20 D mean bias).
  • Objective refractions exhibited greater myopic bias in brown irises compared to blue irises.

Conclusions:

  • Reflected NIR light in aberrometry may originate from structures posterior to cone photoreceptors.
  • The observed myopic bias is consistent with light scattering from the retinal pigment epithelium.
  • Choroidal melanin in brown eyes likely contributes to the increased myopic bias in objective refractions.