Table 5

Preoperative VF-14 scores in the four samples (a score of 100 indicates no impairment, and of 0 indicates maximum impairment)

	USA	Denmark	Manitoba	Barcelona	p Value
Total sample:
No	766	291	152	200
Mean VF-14 score	76	76	71	64	<0.001
SD	17	17	21	27
Eyes with normal retina and macula only:
No	554	169	102	94
Mean VF-14 score	76	79	71	70	<0.001
SD	16	16	21	24