A comparison of two fixation disparity targets

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Fixation disparity is a common visual anomaly affecting binocular vision.
• Accurate and accessible diagnostic tools are crucial for timely intervention.
• The Mallett Test is a widely used standard for assessing fixation disparity.

Purpose of the Study:

• To compare the efficacy of a novel, simple homemade fixation disparity test against the established Mallett Test.
• To evaluate the prevalence and characteristics of fixation disparity in a clinical patient cohort.
• To assess the correlation between fixation disparity direction and the magnitude of associated heterophoria using both tests.

Main Methods:

• A cohort of sixty-four clinical patients underwent testing with both the homemade fixation disparity test and the Mallett Test.
• Data collected included the presence, direction, and magnitude of fixation disparity and associated heterophoria.
• Age distribution of the tested population was recorded and analyzed.

Main Results:

• Twenty-five percent of the tested patients exhibited fixation disparity, identified by either or both tests.
• Comparisons were drawn regarding the direction of fixation disparity detected by each method.
• The magnitude of associated heterophoria was analyzed in relation to the findings from both tests.

Conclusions:

• The simple homemade fixation disparity test demonstrates comparable diagnostic capability to the standard Mallett Test.
• The study highlights the prevalence of fixation disparity in a clinical setting.
• Further investigation into the homemade test's clinical utility and broader application is warranted.