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Updated: Jun 26, 2026

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
08:04

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues

Published on: December 4, 2013

Does binocularly perceived depth correlate with reduced stereoacuity?

Alexandra Lindstrom1, Helen Davis, John P Frisby

  • 1Academic Unit of Ophthalmology & Orthoptics, University of Sheffield, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 22, 2009
PubMed
Summary
This summary is machine-generated.

The Wirt Fly Stereotest

Related Experiment Videos

Last Updated: Jun 26, 2026

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
08:04

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues

Published on: December 4, 2013

Area of Science:

  • Ophthalmology
  • Vision Science
  • Visual Perception

Background:

  • The Wirt Fly Stereotest is used to assess stereoacuity.
  • Previous research by Somers and Hamilton suggested a strong correlation between perceived depth in the Wirt Fly test and stereoacuity thresholds.
  • Induced anisometropia was used to degrade stereothresholds in prior studies.

Purpose of the Study:

  • To evaluate the perceived depth measurement of the Wirt Fly Stereotest.
  • To assess its reliability for determining stereoacuity.
  • To replicate and refine the methodology of Somers and Hamilton's study.

Main Methods:

  • Replication of Somers and Hamilton's study with methodological improvements, including a headrest.
  • Induced anisometropia was created using monocular plus lenses.
  • Subjects used a pointer to indicate perceived depth relative to the Wirt Fly target.

Main Results:

  • Induced anisometropia led to a systematic reduction in perceived depth on the Wirt Fly test.
  • Significant correlations were found between Wirt Fly perceived depth and stereoacuity thresholds (Frisby Near, Randot Circles).
  • Considerable variation in individual subject responses was observed, masking mean values.

Conclusions:

  • The Wirt Fly Stereotest shows significant correlation with stereoacuity measures.
  • However, substantial individual and between-subject variability in perceived depth limits its precision.
  • Its utility as a proxy for stereoacuity is questionable, likely serving only as a rough estimate.