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Clinical science
Scientific reports
Frisby Davis distance stereoacuity values in visually normal children
  1. W E Adams1,
  2. S Hrisos2,
  3. S Richardson1,
  4. H Davis4,
  5. J P Frisby5,
  6. M P Clarke3
  1. 1Department of Ophthalmology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
  2. 2Research Associate, Centre for Health Services Research, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
  3. 3Department of Ophthalmology, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
  4. 4Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield, UK
  5. 5Department of Psychology, University of Sheffield, Sheffield, UK
  1. Correspondence to: Wendy E Adams Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, UK; wendy_stoeryahoo.com

Abstract

Aims: To establish the range of normal distance stereoacuity in young children using the Frisby Davis distance stereotest (FD2).

Methods: Children passing preschool vision screening assessments underwent measurement of distance stereoacuity with the FD2 using a standard testing protocol.

Results: 59 visually normal children aged between 36 months and 68 months were recruited to this study. All 59 were able to understand the test requirements and were examined with the FD2 stereotest. Four (6.8%) had no measurable stereoacuity; 13 (24%) had stereoacuity measurable only at a 3 metre testing distance (mean 92.3 seconds of arc; SD 52.6). These children were significantly younger than the remaining 42 (76%) who demonstrated a stereoacuity response at a 6 metre testing distance (mean 29.6 seconds of arc; SD 13.1, p = 0.008).

Conclusion: The FD2 stereotest enables the measurement of distance stereoacuity in young children. There appears to be a maturational effect with distance stereoacuity improving between 36 months and 68 months. The data on age related normal values will provide a baseline from which to compare outcomes in clinical populations.

  • FD2, Frisby Davis distance stereotest
  • distance stereoacuity
  • Frisby Davis distance stereopsis test
  • children
  • FD2, Frisby Davis distance stereotest
  • distance stereoacuity
  • Frisby Davis distance stereopsis test
  • children

https://doi.org/10.1136/bjo.2005.071761

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    Footnotes

    • Competing interests: John P Frisby and Helen Davis invented the FD2 stereo acuity test. The FD2 stereoacuity test is marketed via Stereotest Ltd. JP Frisby is the director of this company. The other authors have no competing interest.

    • Ethical approval was provided by Newcastle upon Tyne local ethics committee to use the FD2 as an adjunct to preschool vision screening.