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Monovision: Consequences for depth perception from large disparities.

Carrie E Smith1, Robert S Allison1, Frances Wilkinson1

  • 1Centre for Vision Research, York University, 4700 Keele St., Toronto, M3J 1P3, Ontario, Canada.

Experimental Eye Research
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

Monovision treatment impairs stereopsis, affecting depth discrimination at far viewing distances for both young and older adults. This reduction in binocular function may compromise postural stability, especially during activities like walking.

Keywords:
Depth perceptionMonovisionPresbyopiaStereoacuityStereopsisUpper disparity limit

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Area of Science:

  • Vision Science
  • Ophthalmology
  • Human Factors

Background:

  • Monovision treatment is known to degrade stereopsis.
  • The impact of monovision on fine disparity processing, viewing distance, and age remains unclear.
  • Stereopsis is linked to postural stability, necessitating a full understanding of monovision's effects on binocular function.

Purpose of the Study:

  • To assess the short-term effects of optically induced monovision on depth discrimination.
  • To compare these effects in young and older (presbyopic) adults.
  • To investigate the influence of viewing distance on monovision's impact on stereopsis.

Main Methods:

  • Optically induced monovision was applied using -1D and +1D lenses.
  • Stereopsis was assessed at near (62 cm) and far (300 cm) viewing distances.
  • Depth discrimination performance was measured in young and older adults.

Main Results:

  • Monovision significantly reduced the upper limit of stereopsis and discrimination performance at large disparities at a 300 cm viewing distance for both age groups.
  • Younger participants tended to accommodate to minimize blur in one eye, while older participants experienced roughly equivalent blur.
  • Despite differences in blur perception, both groups showed similar detrimental effects of monovision on stereopsis.

Conclusions:

  • Monovision impairs stereopsis and depth discrimination, particularly at far viewing distances typical for locomotion.
  • The findings suggest that monovision may compromise postural stability during activities like walking.
  • Age does not appear to significantly alter the detrimental effects of short-term monovision on stereopsis.