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Ocular refraction with body orientation.

J V Lovasik1, A C Kothe

  • 1University of Waterloo, School of Optometry, Ontario, Canada.

Aviation, Space, and Environmental Medicine
|April 1, 1989
PubMed
Summary
This summary is machine-generated.

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Body inversion does not significantly alter ocular refraction, even with accommodation active or blocked. This finding suggests that visual function tests are reliable despite changes in body position and intraocular pressure.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Physiology

Background:

  • Body inversion increases intraocular pressure (IOP).
  • Visual function tests under elevated IOP can be affected by retinal image clarity.
  • Understanding refractive changes during body inversion is crucial for accurate visual function assessment.

Purpose of the Study:

  • To investigate refractive changes in the eye during different body orientations.
  • To determine if accommodation affects refractive shifts during body inversion.
  • To assess the impact of body inversion on ocular refraction.

Main Methods:

  • Measurements of ocular refraction using a laser optometer.
  • Testing with both freely responding and pharmacologically immobilized accommodation.

Related Experiment Videos

  • Assessing refractive changes across various body orientations.

    • Main Results:

    • Ocular refraction showed minimal variation (<0.50D) across all tested body orientations.
    • Refractive changes were consistent regardless of accommodation status (active or immobilized).
    • Laser optometry provided objective refractive measurements, independent of perceived blur.

    Conclusions:

    • Body inversion causes negligible refractive changes in the eye.
    • These minimal refractive shifts are unlikely to confound pattern-dependent visual function tests.
    • Visual function assessments during altered body positions and IOP are reliable.