Table 3.

Evidence for Responsiveness of the VAQ Total and Subscale Scores at Various Increments of Change Across Anchor Categories

Anchor Category	n	Mean Change (SD)
		VAQ Total	Acuity/Spatial Vision Subscale	Peripheral Vision Subscale
MD
Loss ≥ 3 dB	89	−3.72 (17.18)	−2.29 (27.15)	−3.96 (21.40)
Loss 1.1–2.9 dB	119	0.94 (15.51)	5.02 (25.41)	−3.28 (18.08)
± 1 dB of baseline	224	1.56 (15.76)	4.28 (24.93)	−0.23 (17.87)
Gain 1.1–2.9 dB	120	4.85 (15.73)	8.35 (25.41)	3.59 (19.60)
Gain ≥ 3 dB	38	12.98 (19.82)	17.87 (31.14)	7.53 (21.50)
VA
Loss ≥ 10 letters	106	−2.94 (19.12)	0.06 (29.15)	−4.80 (23.17)
Loss 5.1–9.9 letters	91	3.86 (16.27)	8.70 (25.48)	1.15 (18.82)
± 5 Letters of baseline	362	3.03 (15.60)	5.85 (25.25)	0.85 (17.99)
Gain > 5 letters	28	2.73 (18.00)	4.91 (28.23)	0.18 (20.47)

Note: change is calculated as the follow-up measure − baseline measure, in those subjects with at least 12 months of follow-up. VAQ, Visual Activities Questionnaire; SD, standard deviation; MD, mean deviation; dB, decibels; VA, visual acuity.