TABLE 3.

Interocular difference (right eye minus left eye) by age groups

		Mean (SD)
Age (yrs)	N (Participants)	ETDRS High-Contrast	Low-Contrast Acuity (2.5% Contrast)	Low-Contrast Acuity (1.25% Contrast)
5–6	9	−0.78 (0.83)	−1.70 (3.15)	−0.13 (3.91)
7–8	18	1.33 (3.83)	−0.28 (4.27)	−0.33 (4.96)
9–10	13	−0.23 (2.71)	−0.54 (3.97)	1.92 (5.01)
11–12	11	1.00 (2.45)	−1.70 (3.88)	−3.00 (5.46)
13–14	10	−0.10 (2.92)	0.40 (5.32)	0.10 (5.61)
15–16	15	2.73 (3.63)	4.13 (5.51)	2.40 (3.92)
17–18	15	1.27 (5.26)	2.43 (5.40)	1.93 (2.55)
19–20	10	2.30 (4.19)	2.00 (5.03)	1.10 (3.45)
Total	101	1.1 (3.70)	0.8 (5.00)	0.6 (4.60)
Overall P value (comparing the difference in mean scores across age groups)		0.23	0.02	0.08
Linear trend P value		0.049	0.002	0.12