Table 1 Subjects’ summary in pre-drift parameters

Amount of recession / resection (SD) (range)

6.4 (1.3) mm (4.0–9.0)

Preoperative angle of deviation at distance (SD) (range)

−17.5 (3.7)° (− 27.6– − 10.3).

Preoperative near-distance disparity (SD) (range)

2.2 (3.3)° (−5.7–11.0)

Refractive error in the operative eye (SD) (range)

− 1.1 (2.1) diopters (− 10.1–5.9)

Difference between refractive error of both eyes (SD) (range)

0.5 (0.8) diopters (0.0–4.4)

Difference between visual acuity of both eyes (SD) (range)

0.0 (0.1) (0.0–0.2)

Stereoacuity threshold transformed to log (SD) (range)

2.0 (0.6) log arcsec (1.2–3.6)

Peripheral fusion at distance fixation (proportion)

22 (34%)

Peripheral fusion at near fixation (proportion)

48 (75%)

Initial postoperative angle of deviation at distance (SD) (range)

7.3 (5.2)° (−2.9–21.8)

Initial postoperative near-distance disparity (SD)

1.8 (4.3)° (−11.9–10.8)