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Consequences of monocular diplopia for the contrast sensitivity function

R L Woods1, A Bradley, D A Atchison

  • 1Centre for Eye Research, School of Optometry, Queensland University of Technology, Australia. R.Woods@gcal.ac.uk

Vision Research
|November 1, 1996
PubMed
Summary
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Monocular diplopia, or double vision in one eye, can create notches in the contrast sensitivity function (CSF). This study confirms multiple CSF notches with hyperopic defocus, validating an aberration model.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Optical Physics

Background:

  • Perceptual monocular diplopia, or double vision in one eye, is a documented phenomenon despite the eye typically forming a single retinal image.
  • Astigmatic defocus has been previously linked to a notch in the contrast sensitivity function (CSF).

Purpose of the Study:

  • To investigate Verhoeff's model explaining monocular diplopia via defocus and ocular aberrations.
  • To predict and experimentally verify multiple notches in the CSF caused by hyperopic spherical defocus.

Main Methods:

  • Measured ocular transverse aberration functions and monocular diplopia in cyclopleged subjects.
  • Measured monochromatic and polychromatic CSF for vertical gratings under best refraction, simulated myopia, and hyperopia.
  • Utilized an aberration model to predict CSF notches.

Related Experiment Videos

Main Results:

  • Observed multiple notches in the CSF experimentally.
  • Notches in polychromatic CSF were broader and smaller compared to monochromatic CSF.
  • The aberration model successfully predicted CSF notches with hyperopic spherical defocus.

Conclusions:

  • Monocular diplopia, influenced by ocular aberrations and defocus, can lead to multiple notches in the CSF.
  • Experimental findings support the aberration model's predictions.
  • Results have implications for clinical CSF measurement techniques.