Contribution of a Real Depth Distance Stereoacuity Test to Clinical Management

Table 1

Depth discrimination thresholds of control subjects using the near stereoacuity tests, Frisby, TNO, and the FD2 at 1 m, 3 m, and 6 m. Combined (CT), monocular (MT), and binocular (BT) depth discrimination thresholds. Mean, standard deviation (SD) and median in logarithm of arc seconds. Range of test and subjects in arc seconds. Not measurable (NM).

Test	Mean CT (SD) Median (Log seconds)	Range of CT (seconds)	Measurable range of stereoacuity test (seconds)	Mean BT (SD) Median (Log seconds)	Mean MT (SD) Median (Log seconds)
TNO	1.75 (040) 1.78	15–1980	15–1980	1.75 (0.40) 1.78	NM
Frisby	1.74 (0.34) 1.83	20–170	20–600	1.74 (0.34) 1.83	NM
FD2 6M	1.14 (0.28) 1.18	5–50	5–50	1.14 (0.28) 1.18	NM
FD2 3M	1.45 (0.23) 1.30	20–160	140–200	1.47 (0.25) 1.30	2.34 (0.2) 2.30
FD2 1M	2.28 (0.39) 2.26	182–558	952–2042	2.32 (0.10) 2.31	3.13 (0.15) 3.14