Table 2.

Changes in postoperative mean deviations at distance and at near fixation, and the mean amount of near-distance differences over time. (PD ± mean SD).

	All subjects	True CI Group	Masked CI Group	P value*
Postop 6 months
Distance	1.8 ± 3.7	1.4 ± 2.9	1.5 ± 7.9	0.93
Near	3.2 ± 4.9	2.5 ± 4.3	2.9 ± 9.5	0.84
Near-Distance difference	1.4 ± 3.3	1.1 ± 3.3	1.9 ± 3.2	0.41
Postop 12 months
Distance	2.6 ± 3.5	2.2 ± 3.3	3.5 ± 3.9	0.22
Near	3.5 ± 4.7	2.9 ± 4.3	4.8 ± 5.3	0.14
Near-Distance difference	0.9 ± 3.2	0.6 ± 2.6	1.4 ± 4.3	0.43
Postop 24 months
Distance	3.2 ± 5.2	2.4 ± 4.5	4.8 ± 6.2	0.09
Near	4.3 ± 6.0	3.3 ± 4.9	6.4 ± 7.3	0.06
Near-Distance difference	1.1 ± 2.8	0.9 ± 2.7	1.5 ± 3.0	0.41
Postop 36 months
Distance	3.5 ± 4.7	2.9 ± 4.5	4.7 ± 5.1	0.17
Near	4.4 ± 5.9	3.3 ± 5.1	6.7 ± 6.8	0.041
Near-Distance difference	1.0 ± 3.4	0.4 ± 2.9	2.0 ± 4.1	0.12

CI = convergence insufficiency; Masked CI group = near-distance differences of <10 PD before diagnostic occlusion and ≥10 PD after diagnostic occlusion; PD  = prism diopters; Postop = postoperative; SD = standard deviation; True CI group = near-distance difference ≥10 PD before and after diagnostic occlusion;

*P value calculated using Mann-Whitney U test between True CI and Masked CI groups.