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Testing distance stereoacuity with the Frisby-Davis 2 (FD2) test
Jonathan M Holmes1, Sherry L Fawcett
1Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. holmes.jonathan@mayo.edu
American Journal of Ophthalmology
|January 18, 2005
Summary
The Frisby-Davis 2 (FD2) distance stereoacuity test requires a protocol that accounts for monocular cues. A modified protocol successfully identified stereoblind patients without false positives, ensuring accurate distance stereoacuity measurement.
Area of Science:
- Ophthalmology
- Vision Science
Background:
- Stereoacuity assessment is crucial for diagnosing visual impairments.
- Existing tests may be confounded by monocular cues.
Purpose of the Study:
- To develop and validate a presentation protocol for the Frisby-Davis 2 (FD2) distance stereoacuity test.
- To ensure accurate measurement of binocular stereoacuity by addressing monocular cueing.
Main Methods:
- Prospective data collection involving 95 patients with various visual conditions.
- Utilized the FD2 test with a modified staircase procedure.
- Incorporated monocular and binocular testing phases, referencing Preschool Randot and near Frisby tests to identify stereoblindness.
Main Results:
- 37% of patients passed the FD2 under monocular conditions, highlighting the influence of monocular cues.
- A modified protocol including a monocular test phase was developed.
- The new protocol correctly identified 28 stereoblind patients with no false positives.
Conclusions:
- The FD2 is a valuable tool for distance stereoacuity.
- An effective presentation protocol must mitigate the impact of monocular cues.
- The refined protocol enhances the reliability of the FD2 test.