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Br J Ophthalmol 89:1438-1441 doi:10.1136/bjo.2005.071761
  • Clinical science
    • Scientific reports

Frisby Davis distance stereoacuity values in visually normal children

Table 2

 Suggested FD2 stereoacuity norms (seconds of arc) (SD) for children ⩾48 months and <48 months performing the test at 6 metres.

Mean age Mean stereoacuity (seconds of arc) at 6 metres test distance (SD)
Age ⩾48 months (n = 29) 30 (13)
Age<48 months (n = 13) 50 (8)
Total number 42

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