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Frisby Davis distance stereoacuity values in visually normal children

¹ Department of Ophthalmology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
² Research Associate, Centre for Health Services Research, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
³ Department of Ophthalmology, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
⁴ Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield, UK
⁵ Department of Psychology, University of Sheffield, Sheffield, UK

Correspondence to:
Correspondence to:
Wendy E Adams
Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, UK; wendy_stoer{at}yahoo.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.

Abbreviations: FD2, Frisby Davis distance stereotest

Keywords: distance stereoacuity; Frisby Davis distance stereopsis test; children

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