Table 2.
Fixation instability and vergence instability mean ± SD BCEAs for each group, and each etiology, and stereoacuity subgroup for children treated for anisometropia, strabismus, or both.
| Group | Nonpreferred eye BCEAa (log deg2) | Preferred eye BCEA (log deg2) | Vergence BCEA (log deg2) |
|---|---|---|---|
| Amblyopic (n = 98) | −0.02 ± 0.46 | −0.21 ± 0.40 | −0.02 ± 0.48 |
| Nonamblyopic (n = 62) | −0.07 ± 0.51 | −0.16 ± 0.43 | 0.00 ± 0.47 |
| Control (n = 46) | −0.35 ± 0.23 | −0.39 ± 0.29 | −0.38 ± 0.29 |
| Etiology | |||
| Anisometropic (n = 64) | −0.23 ± 0.43 | −0.28 ± 0.43 | −0.17 ± 0.48 |
| Strabismic (n = 44) | 0.09 ± 0.46 | −0.08 ± 0.39 | 0.06 ± 0.47 |
| Combined mechanism (n = 52) | 0.10 ± 0.46 | −0.17 ± 0.38 | 0.11 ± 0.44 |
| Stereoacuity category | |||
| Bifixation (≤60 arcsec; n=15) | −0.35 ± 0.40 | −0.29 ± 0.42 | −0.29 ± 0.43 |
| Monofixation (100–800 arcsec, n = 47) | −0.15 ± 0.48 | −0.17 ± 0.47 | −0.08 ± 0.53 |
| Nil (> 800 arsec, n = 98) | 0.07 ± 0.45 | −0.18 ± 0.38 | 0.06 ± 0.44 |
a
BCEA, bivariate contour ellipse area.