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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...

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Related Experiment Video

Updated: Jun 23, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Ocular responses and visual performance after high-acceleration force exposure.

Ming-Ling Tsai1, Chun-Cheng Liu, Yi-Chang Wu

  • 1Department of Ophthalmology, Tri-Service General Hospital, Taipei, Taiwan.

Investigative Ophthalmology & Visual Science
|May 16, 2009
PubMed
Summary

High-acceleration force exposure temporarily reduced visual acuity and altered ocular structures, including corneal thickening and pupillary dilation. Reduced contrast sensitivity persisted for 30 minutes post-exposure.

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Published on: September 18, 2012

Area of Science:

  • Ophthalmology
  • Aerospace Medicine
  • Human Physiology

Background:

  • High-acceleration forces are encountered in aviation and spaceflight.
  • Understanding the impact of such forces on ocular health and visual function is crucial for safety.

Purpose of the Study:

  • To evaluate the effects of high-acceleration force exposure on ocular responses and visual performance.
  • To assess changes in visual acuity, contrast sensitivity, and anterior segment parameters.

Main Methods:

  • Fourteen male participants were exposed to +9 Gz force using a human centrifuge.
  • Visual performance was assessed using the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart and contrast sensitivity testing.
  • Ocular responses were evaluated via biomicroscopy and topographic mapping post-exposure.

Main Results:

  • A significant transient reduction in visual acuity was observed immediately after centrifugation.
  • Temporary ocular anterior segment reactions included corneal thickening, increased anterior chamber depth (ACD), and pupillary enlargement.
  • Contrast sensitivity decreased significantly at low and medium spatial frequencies, with effects persisting for 30 minutes.

Conclusions:

  • High-acceleration force can induce transient visual acuity reduction and temporary ocular changes.
  • Prolonged increases in anterior chamber depth and pupillary dilation were noted, along with persistent contrast sensitivity deficits.
  • Further research is needed to elucidate the underlying mechanisms of these observed ocular responses.