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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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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

Binocular vision changes in university students: a 3-year longitudinal study.

Jorge Jorge1, José Borges de Almeida, Manuel A Parafita

  • 1Department of Physics (Optometry), School of Sciences, University of Minho, Braga, Portugal. jorge@fisica.uminho.pt

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|October 4, 2008
PubMed
Summary

Changes in accommodation and binocular vision were tracked in university students over three years. Increased base-in fusional vergence at distance and near predicted myopia progression in young adults.

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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Published on: March 29, 2022

Area of Science:

  • Ophthalmology and Optometry
  • Vision Science
  • Public Health

Background:

  • University students are a key demographic for studying refractive error progression.
  • Understanding changes in binocular vision and accommodation is crucial for myopia research.
  • Longitudinal studies provide valuable insights into vision development and changes.

Purpose of the Study:

  • To investigate longitudinal changes in accommodation and binocular vision parameters over three years.
  • To evaluate the influence of these parameters on refractive changes in Portuguese university students.
  • To identify potential predictors of myopia shift in young adults.

Main Methods:

  • A 3-year longitudinal study involving 118 university students (mean age 20.6 years).
  • Evaluated subjective refraction, phoria, vergences (distance/near), accommodative convergence/accommodative ratio, accommodation lag, and relative accommodation.
  • Compared vision parameters between baseline and follow-up examinations.

Main Results:

  • Statistically significant differences were found in distance and near phoria, and vergence break/recovery points.
  • All measured accommodation parameters showed significant changes over the study period.
  • Higher break values for base-in fusional vergence at distance and near were associated with myopia shift.

Conclusions:

  • Significant changes in near heterophoria, fusional vergences, and positive relative accommodation were observed.
  • The break value of base-in fusional vergence is a significant predictor of myopic shift.
  • These findings highlight the role of binocular vision in myopia progression among young adults.