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Low visual acuity is associated with the decrease in postural sway.

Masanobu Uchiyama1, Shinichi Demura

  • 1Kanazawa College of Art, Kanazawa, Japan. masanobu.uchiyama@gmail.com

The Tohoku Journal of Experimental Medicine
|November 7, 2008
PubMed
Summary

Visual acuity impacts upright posture control. Low visual acuity individuals benefit from combined central and peripheral vision, unlike those with high visual acuity, suggesting personalized visual strategies are necessary.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Ophthalmology

Background:

  • Vision is crucial for maintaining upright postural control through afferent feedback to the cerebellum.
  • Existing research often classifies vision into central and peripheral, but their distinct roles in postural control across varying visual acuities remain underexplored.

Purpose of the Study:

  • To investigate how visual acuity levels influence the role of central and peripheral vision in maintaining upright posture.
  • To determine the specific contributions of central and peripheral visual fields to postural stability under different visual acuity conditions.

Main Methods:

  • Participants were categorized into high (visual acuity > 1.0) and low (visual acuity < 0.3) visual acuity groups.
  • Postural sway was measured over one minute under three visual conditions: central vision only, full vision (central and peripheral), and no vision.
  • The effects of central vision were assessed by comparing 'no vision' to 'central vision' conditions, and peripheral vision by comparing 'central vision' to 'full vision' conditions.

Main Results:

  • The low visual acuity group demonstrated reduced antero-posterior sway amplitude when utilizing both central and peripheral vision, a benefit not observed in the high visual acuity group.
  • High-frequency postural sway was significantly lower in the low visual acuity group compared to the high visual acuity group under both 'no vision' and 'central vision' conditions.
  • These findings indicate that visual acuity modulates the reliance on and effectiveness of different visual fields for postural control.

Conclusions:

  • Visual acuity is a critical factor that must be considered when evaluating the contribution of central and peripheral vision to postural stability.
  • Individuals with lower visual acuity may rely more heavily on combined visual field information for effective postural control.