What does this research mean for the field?

The slope of the forced vergence fixation disparity curve does not significantly differentiate between visually symptomatic and asymptomatic patients. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

This research aims to differentiate asymptomatic from symptomatic patients using forced vergence fixation disparity curves.

March 21, 2026

Differentiation of Asymptomatic Patients from Symptomatic Patients by the Slope of the Forced Vergence Fixation Disparity Curve

Key Points

This research aims to differentiate asymptomatic from symptomatic patients using forced vergence fixation disparity curves.
Divided 89 optometry students into asymptomatic and symptomatic groups based on case history.
Generated forced vergence fixation disparity curves using a Disparometer.
Calculated slopes for each curve and labeled them as steep or flat based on a defined cutoff point.
Steep curves did not correlate well with symptomatic patients.
Flat curves did not correlate well with asymptomatic patients.
No significant difference was found between the two groups based on the t-test.

Abstract

ABSTRACT Eighty‐nine optometry students were divided into an asymptomatic group and a symptomatic group on the basis of a case history. A forced vergence fixation disparity (FD) curve was generated for each subject using a Disparometer (Vision Analysis, Columbus, Ohio). Slopes were calculated for each curve. In addition, each curve was labeled steep or flat based on a previously determined cutoff point of −0.96 min/Δ (Sheedy, 1980). Steep curves did not correlate well with symptomatic patients, whereas flat curves did not correlate well with asymptomatic patients. An independent t‐test found no significant difference between the two groups.

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