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Related Experiment Videos

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
PubMed
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.

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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:

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  • 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.