Table 1. Demographic Features of Patients With Strabismus.

Characteristic	Mean (SD) [Range]					Diplopia Present, %
	Age at Visit, mo	Age at Onset, mo	Both Eyes, No. of Letters		Angle of Strabismus in Primary Position, PDs
			ETDRS	IOD
			All patients (n = 90)	426 (305) [30-1088]			237 (308) [1-1064]	86 (8) [57-98]	5.7 (5) [0-15]	23 (14) [2-70]	47
	Esotropia
Infantile (n = 13)	330 (253) [48-950]	11 (11) [1-36]	83 (7) [67-91]	6 (6) [0-15]	34 (16) [20-70]	30
Childhood (n = 7)	346 (350) [30-958]	37 (24) [18-72]	81 (5) [75-89]	9 (12) [1-15]	32 (15) [12-55]	0
Acquired (n = 11)	697 (235) [228-956]	631 (260) [60-912]	85 (6) [75-94]	5.7 (4) [0-14]	15 (5) [10-25]	100
Exotropia
Intermittent (n = 22)	211 (194) [28-817]	91 (102) [6-460]	86 (10) [57-98]	4 (3) [0-14]	28 (12) [12-65]	18
Consecutive (n = 9)	376 (299) [112-794]	20 (33) [2-108]	87 (6) [78-98]	3 (2.7) [0-9]	24 (12) [4-45]	22
Acquired (n = 3)	364 (323) [136-734]	284 (379) [36-720]	83 (2) [81-85]	9 (4) [5-12]	30 (18) [14-50]	33
Congenital SOP (n = 10)	446 (228) [33-709]	223 (242) [6-620]	89 (5) [84-68]	6 (7) [0-15]	17 (6) [6-25]	90
Acquired HT (n = 12)	732 (214) [331-1088]	648 (265) [192-) 1064]	80 (7) [64-89]	6 (6) [1-15]	11 (9) [2-35]	100
Combined V/H (n = 3)	637 (304) [286-814]	502 (414) [24-744]	86 (2) [84-88]	8 (8) [3-15]	23 (19) [8-45]	67

Abbreviations: ETDRS, Early Treatment Diabetic Retinopathy Study visual acuity; HT, hypertropia; IOD, interocular difference; PDs, prism diopters; SOP, superior oblique palsy; V/H, vertical and horizontal strabismus (each component greater than 10 PDs).