Myopes Show Greater Visually Induced Postural Responses Than Emmetropes

Area of Science:

• Ophthalmology
• Biomechanics
• Human Physiology

Background:

• Vision is critical for maintaining postural control.
• Visual dependence varies significantly among individuals.
• The influence of ametropia (refractive error) on postural control remains unclear.

Purpose of the Study:

• To investigate differences in postural control between myopes and emmetropes under visual stimulation.
• To determine if these differences persist with barrel and pincushion optical distortions.
• To inform potential improvements in lens design for better visual and postural function.

Main Methods:

• 24 participants (12 myopes, 12 emmetropes) aged 19-35 underwent eye exams.
• Subjects fixated on a point while peripheral checkerboard stimuli (static/dynamic) were presented.
• Postural responses were measured under three optical distortion conditions (plan, pincushion, barrel).

Main Results:

• Myopes exhibited greater postural instability than emmetropes with dynamic peripheral stimuli (P=0.0235).
• Significant differences in postural behavior were observed between groups under optical distortions (P=0.0064).

Conclusions:

• Refractive error, specifically myopia, appears to influence an individual's reliance on vision for postural control.
• These findings highlight ametropia as a potential factor in the variability of visual contributions to posture.