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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Published on: July 21, 2020

Interocular differences in visual latency induced by reduced-aperture monovision.

Sotiris Plainis1, Dionysia Petratou, Trisevgeni Giannakopoulou

  • 1Institute of Vision and Optics, School of Health Sciences, University of Crete, Crete, Greece. plainis@med.uoc.gr

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 3, 2013
PubMed
Summary

Small-aperture optics for presbyopia can cause significant interocular differences in visual latency. This may lead to distorted motion perception and potential hazards due to anisocoria.

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Optometry

Background:

  • Presbyopia affects near vision, often managed with optical aids.
  • Small-aperture optics increase depth-of-focus but can alter ocular responses.
  • Understanding induced visual latency differences is crucial for patient safety.

Purpose of the Study:

  • To investigate interocular temporal response differences caused by monocular small-aperture optics.
  • To assess the impact of varying aperture sizes on visual evoked potentials (VEPs).
  • To explore the relationship between pupil size, retinal illuminance, and visual latency.

Main Methods:

  • Measured monocular and binocular pattern-reversal VEPs in normal subjects.
  • Utilized small-aperture contact lenses (1.5-3.5 mm) and an opaque stop.
  • Varied stimulus luminance and pupil size to analyze VEP latency and amplitude.

Main Results:

  • Small-aperture lenses reduced VEP P100 amplitude and increased latency.
  • Inter-ocular latency differences reached 20-25 ms with a 1.5 mm aperture.
  • Effects were attributed to changes in retinal illuminance from pupil area restriction.

Conclusions:

  • Monocular small-aperture optics induce significant interocular latency differences (anisocoria).
  • These differences may cause visual distortions, particularly in motion perception (Pulfrich effect).
  • Potential hazards associated with altered depth perception and movement analysis warrant consideration.