Table 4.

Visual Acuity Results in the Ahmed Baerveldt Comparison Study

	Ahmed Group	Baerveldt Group	P-value
Snellen VA, logMAR mean ± SD
Baseline	1.07 ± 1.01	1.04 ± 1.00	.80†
1 year	1.18 ± 1.07	1.23 ± 1.19	.74†
Loss of ≥2 Snellen lines, n (%)*	40 (30)	40 (34)	0.57‡
Glaucoma	5 (13%)	7 (18%)
Macular disease	5 (13%)	6 (15%)
Cataract	7 (18%)	6 (15%)
Other	12 (30%)	15 (38%)
Unknown	11 (28%)	6 (15%)

VA – Visual Acuity

^*Patients may have more than one reason for decreased vision.

^†Two sided Student t-test

^‡Chi-square test