The effect of trial frames on adaptive gait.

Area of Science:

• Biomechanics
• Ophthalmology
• Human Movement Science

Background:

• Adaptive gait research often uses trial frames to simulate visual conditions.
• Trial frames can restrict the wearer's peripheral visual field.
• The impact of trial frames themselves on gait has not been fully investigated.

Purpose of the Study:

• To investigate how the use of trial frames affects adaptive gait.
• To determine if trial frames, independent of lens correction, influence obstacle crossing kinematics.

Main Methods:

• Fifteen participants with normal vision crossed an obstacle under three conditions: habitual, half-eye trial frame, and full aperture trial frame.
• No lenses were used; the focus was on visual field occlusion.
• Kinematic analysis assessed obstacle crossing and visual field occlusion.

Main Results:

• Both half-eye and full aperture trial frames reduced the visual field.
• Participants wearing trial frames exhibited significantly higher foot lifts and increased step-over time compared to the habitual condition.
• No significant differences in obstacle crossing were observed between the two types of trial frames.

Conclusions:

• The use of trial frames, regardless of type (full or half-eye), can independently influence adaptive gait parameters.
• Researchers must consider not only the visual correction but also the method of lens mounting (e.g., trial frames) in gait studies.
• Findings suggest potential confounding effects of trial frames in vision and gait research.