Table 2.

Clinical characteristics of the patient in case 2.

Characteristics		Baseline	1 month	3 months	6 months
BCVA	Right eye	20/50	20/32	20/30	20/25
	Left eye	20/30	20/25	20/25	20/20
Deviation degree		−30		−10	−5
PEP	Horizontal	34	5	24	13
	Vertical	5	8	8	4
Stereopsis	S0	0	0	1	1
	S1	0	0	1	1
	S2	1	1	1	1
Cobb angle		13	–	0	0

BCVA, best-corrected visual acuity; PEP, perceptual eye position.

S0 (zero-order stereopsis) was graded as follows: 0 = failed test, 1 = 100 arcseconds, 2 = 200 arcseconds, 3 = 400 arcseconds, 4 = 800 arcseconds.

S1 (first-order stereopsis) was graded as follows: 0 = failed test, 1 = passing at a speed of 50 arcs/ms, and 2 = passing at a speed of 600 arcs/ms.

S2 (second-order stereopsis) was graded as follows: 0 = failed test, 1 = 100% accuracy, 2 = 75% accuracy, 3 = 50% accuracy, 4 = 25% accuracy.

PEP and stereopsis were assessed with a visual and perceptual evaluation system.