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Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
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Test retest variability in stereoacuity measurements.

Jignasa Mehta1, Anna O'Connor1

  • 1School of Health Sciences, University of Liverpool.

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|September 14, 2023
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Summary
This summary is machine-generated.

This study compared the test-retest variability of four stereoacuity tests in adults. The Asteroid test showed the least variation, while TNO and Frisby offered good reliability over a narrower range.

Keywords:
Stereoacuitystereoteststest–retest variability

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Clinical Measurement

Background:

  • Clinician's choice of stereotest relies on measurement robustness, including sensitivity, specificity, and test-retest variability.
  • Limited data exist on the test-retest variability of newer stereotests compared to established ones.
  • Understanding test-retest variability is crucial for accurate clinical assessment of stereoacuity.

Purpose of the Study:

  • To determine the test-retest variability of four stereotests: TNO, Frisby, Lang Stereopad, and Asteroid (Accurate STEReotest On a mobIle Device).
  • To compare stereoacuity measurements between these tests in an adult population.
  • To provide data for clinicians selecting reliable stereotests.

Main Methods:

  • Stereoacuity was measured twice in adult participants (≥18 years) with normal vision using TNO, Frisby, Lang Stereopad, and Asteroid.
  • Participants had best-corrected visual acuity ≥0.3 logMAR and interocular difference <0.2 logMAR.
  • Bland-Altman analysis assessed agreement within and between tests; Wilcoxon signed-rank tests compared stereo thresholds.

Main Results:

  • Fifty-four adults participated. Test-retest variability was clinically insignificant for TNO, Frisby, and Asteroid (mean bias ≤0.06 log seconds of arc).
  • The Asteroid test exhibited the smallest variation between repeated measures (mean bias: -0.01 log seconds of arc).
  • The Frisby and Lang Stereopad tests showed the narrowest and widest limits of agreement, respectively. Significant mean bias was found between Frisby and Lang Stereopad.

Conclusions:

  • TNO and Frisby tests demonstrate good reliability but cover a narrower stereoacuity range.
  • The Asteroid test offers less variation on repeated testing and a wider testing range.
  • Further research is needed to assess variability in individuals with reduced stereoacuity.