What question did this study set out to answer?

To evaluate the reliability of the nonius-line method in measuring ocular deviation compared to objective measurements.

March 21, 2026

Comparison of Simultaneously Obtained Objective and Subjective Measurements of Fixation Disparity

Key Points

To evaluate the reliability of the nonius-line method in measuring ocular deviation compared to objective measurements.
Conducted simultaneous measurements of fixation disparity using both objective and subjective methods.
Objective measurements based on binocular eye movement recordings.
Subjective measurements based on nonius-line displacement.
Significant differences were observed between the objective and subjective measurements.
Findings suggest that the nonius-line method may not reliably measure ocular deviation or fusional status.

Abstract

ABSTRACT Simultaneous objective (based on binocular eye movement record) and subjective (noniusline displacement) measurements of horizontal and vertical fixation disparity were carried out in order to evaluate the reliability of the nonius‐line method of measuring ocular deviation. Significant differences were found between the subjective and objective measurements. These differences indicate that the nonius‐line method is unreliable for the measurement of ocular deviation or fusional status.

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