Table 2.

Stratification of change in visual acuity at 3, 6 and 12 months after switching (%)

	3 months postswitch (%)	6 months postswitch (%)	12 months postswitch (%)
Gain
≥15 letters	3	3	4
10–14 letters	4	7	6
5–9 letters	18	18	14
No change	53	49	49
Loss
5–9 letters	14	13	13
10–14 letters	4	6	9
≥15 letters	3	4	5