Binocular sighting ocular dominance changes with different angles of horizontal gaze

Area of Science:

• Ophthalmology
• Neuroscience
• Vision Science

Background:

• Ocular dominance is typically assessed in the primary gaze position.
• Recent findings suggest eye dominance may change during horizontal gaze.
• This study explores if this phenomenon extends to various ocular dominance tests.

Purpose of the Study:

• To investigate the occurrence of eye dominance changes in the contralateral field of horizontal gaze.
• To compare these changes across different ocular dominance tests.

Main Methods:

• Ten participants with established right eye dominance were tested.
• Ocular dominance was assessed using pointing, hole-in-card, and Miles ABC tests.
• Testing occurred at 10-degree intervals from 40 degrees left to 40 degrees right gaze.

Main Results:

• A shift in eye dominance was observed in the contralateral gaze field for most participants.
• The angle of dominance change varied by test: median 30 degrees (hole-in-card, Miles ABC) and 20 degrees (pointing).
• Statistically significant differences were found between the hole-in-card and pointing tests.

Conclusions:

• Eye dominance can indeed change when viewing in the contralateral horizontal gaze field.
• The specific angle at which this change occurs may differ based on the testing methodology.