Correlation Between Refractive Asymmetry and Eye Dominance According to the Sensory and Fixation Method

Area of Science:

• Ophthalmology
• Vision Science
• Optometry

Background:

• Eye dominance distribution in humans is method-dependent.
• Previous studies on refractive asymmetry and eye dominance show inconsistent results.
• Understanding these relationships is crucial for visual function assessment.

Purpose of the Study:

• To analyze the relationship between refractive asymmetry and eye dominance using fixation and sensory methods.
• To assess the concordance between fixation and sensory eye dominance measurements.
• To investigate the influence of anisometropia magnitude on these relationships.

Main Methods:

• 112 subjects were evaluated for refractive asymmetry and eye dominance.
• Refractive error was determined via objective and subjective refraction.
• Fixation eye dominance was assessed using the hole-in-card method; sensory dominance used the binocular orientation combination task.

Main Results:

• Right eye showed greater fixation dominance (p=0.001), while sensory dominance was more even (p=0.85).
• Concordance between fixation and sensory methods was not significant (p=0.952).
• Sensory eye imbalance was greater in anisometropia (p=0.015) and positively correlated with refractive asymmetry (r=0.239, p=0.011).

Conclusions:

• Fixation and sensory eye dominance assessments yield different results.
• Sensory eye imbalance is more pronounced in individuals with anisometropia.
• Greater refractive asymmetry is associated with a larger absolute balance point.