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Frisby Davis distance stereoacuity values in visually normal children
W E Adams1, S Hrisos, S Richardson
1Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, UK. wendy_stoer@yahoo.com
The British Journal of Ophthalmology
|October 20, 2005
Summary
The Frisby Davis distance stereo test (FD2) measures distance stereoacuity in young children. Normal values show improvement with age, providing a baseline for clinical comparisons.
Area of Science:
- Ophthalmology
- Pediatric Vision
- Stereopsis Measurement
Background:
- Assessing distance stereoacuity in young children is crucial for early detection of visual impairments.
- The Frisby Davis distance stereo test (FD2) is a tool used for evaluating stereopsis.
Purpose of the Study:
- To establish the normal range of distance stereoacuity in children aged 36 to 68 months using the FD2.
- To investigate the relationship between age and distance stereoacuity in this cohort.
Main Methods:
- A standard testing protocol was used to measure distance stereoacuity with the FD2 in visually normal children.
- Participants were children aged 36–68 months who passed preschool vision screening.
Main Results:
- Out of 59 children, 6.8% had no measurable stereoacuity, and 24% had stereoacuity only at 3 meters.
- The remaining 76% demonstrated stereoacuity at 6 meters, with significantly better results in older children (mean 29.6 arc seconds vs. 92.3 arc seconds).
Conclusions:
- The FD2 is effective for measuring distance stereoacuity in young children.
- Distance stereoacuity shows a maturational improvement between 36 and 68 months of age.
- The study provides age-related normative data for clinical use.
