Table 3.

Baseline Ocular Alignment and Stereoacuity

	Distance Assessment		Near Assessment
	N	%	N	%
Deviation Type
No exodeviation	0	0%	18	3%
Exophoria	0	0%	133	20%
Intermittent exotropia	571	88%	499	77%
Constant exotropia	81	12%	2	<1%
Exotropia Control Score
0	13	2%	185	28%
1	110	17%	228	35%
2	179	27%	109	17%
3	140	21%	89	14%
4	111	17%	36	6%
5	99	15%	5	<1%
Mean (SD)	2.8 (1.4)		1.4 (1.2)
Range	0.0 to 5.0		0.0 to 5.0
Exodeviation (Δ) by Prism and Alternate Cover Test
<0 (esodeviation)	0	0%	1	<1%
0	0	0%	15	2%
1–9	0	0%	54	8%
10–14	12	2%	131	20%
16–18	99	15%	123	19%
20–25	327	50%	191	29%
30–35	176	27%	108	17%
40–50	38	6%	29	4%
Mean	25 (7)		20 (10)
Range	10 to 50		−4 to 50
Stereoacuity (seconds of arc)
40	n/a	n/a	183	28%
60	214	33%	146	22%
100	127	19%	136	21%
200	94	14%	70	11%
400	86	13%	71	11%
800	n/a	n/a	14	2%
Nil	131	20%	32	5%
Median	100		60
Range	60 to Nil		40 to Nil

Δ = Prism diopters

n/a refers to levels not assessed by distance stereoacuity