Table 1.

Cooperation (determination of monocular visual acuity of both eyes possible) of 385 children coming to a paediatric routine examination. 10% quantiles (α_0.1) for visual acuity (Lea single symbols) of the “better” eye of each child and children who had an acuity difference >1 line between both eyes

Age (months)	No	Cooperation/rate	α0.1	Difference >1 line
21–30	156	13 (8%)	0.32	2 (15%)
31–36	16	9 (56%)	0.63	0 (0%)
37–48	71	54 (76%)	1.0	6 (11%)
49–60	63	60 (95%)	0.80	15 (25%)
60–93	79	72 (91%)	1.0	13 (18%)
21–93	385	208 (54%)	0.80	36 (17%)