Vision Loss and Recovery after Baerveldt Aqueous Tube Shunt Implantation
Table 2
Descriptive characteristics of unexplained long-term vision loss among 247 eyes after Baerveldt tube shunt implantation.
Variable
Long-term unexplained vision loss
Mild or moderate
Severe
Total
Others
()
()
()
()
Age, mean (SD), years
75.8 (10.2)
63.1 (24.1)
71.6 (16.7)
70.0 (14.5)
SexØ, number (%)
Male
5 (41.7)
6 (100)
11 (61.1%)
114 (49.8)
Female
7 (58.3)
0
7 (38.9%)
115 (50.2)
Race/ethnicity, number (%)
White
10 (83.3)
1 (16.7%)
11 (61.1)
89 (38.9)
Asian
1 (8.3)
1 (16.7%)
2 (11.1)
36 (15.7)
Hispanic
1 (8.3)
2 (33.3%)
3 (16.7)
42 (18.3)
African American
0
1 (16.7%)
1 (5.6)
28 (12.2)
Others
0
1 (16.7%)
1 (5.6)
34 (14.8)
Diagnosis†, number (%)
Primary open-angle glaucoma
8 (66.7)
4 (66.7)
12 (66.7)
136 (59.4)
Chronic angle-closure glaucoma
1 (8.3)
0
1 (5.6)
40 (17.5)
Secondary open-angle glaucoma
1 (8.3)
0
1 (5.6)
15 (6.6)
Low-tension glaucoma
0
0
0
3 (1.3)
Pseudoexfoliation glaucoma
2 (16.7)
0
2 (11.1)
15 (6.6)
Pigmentary glaucoma
0
1 (16.7)
1 (5.6)
2 (0.9)
Juvenile glaucoma
0
1 (16.7)
1 (5.6)
17 (7.4)
Plateau iris glaucoma
0
0
0
1 (0.4)
Preoperative Snellen visual acuity, median (range)
20/70 (20/20 to 20/400)
20/75 (20/50 to 20/200)
20/75 (20/20 to 20/400)
20/60 (20/15 to 20/4000)
Postoperative day 1 (POD1) Snellen visual acuity†‡, median (range)
20/800 (20/70 to LP)
20/400 (20/200 to LP)
20/400 (20/70 to LP)
20/200 (20/25 to HM)
Change in preoperative versus POD1 Snellen visual acuity†‡, mean lines Snellen VA (SD)
5.8 ± 3.9
6.6 ± 4.2
6.1 ± 3.9
3.1 ± 3.6
Lens status†, number (%)
Phakic
2 (16.7)
3 (50)
5 (27.8)
53 (23.1)
Pseudophakic
10 (83.3)
3 (50)
13 (72.2)
176 (76.9)
Preoperative intraocular pressure†, mean (SD), mmHg
22.7 ± 6.1
32 ± 13.5
25.8 ± 9.9
24.5 ± 8.0
Preoperative intraocular pressure
<21, number (%)
5 (41.7)
2 (33.3)
7 (38.0)
84 (36.7)
≥21, number (%)
7 (58.3)
4 (66.7)
11 (61.1)
145 (63.3)
POD1 intraocular pressure, mean (SD), mmHg
23.1 ± 12.2
20.7 ± 11.8
22.2 ± 11.7
20.2 ± 11.9
Change in preoperative versus POD1 intraocular pressure†, mean (SD)
0.2 ± 4.2
−11.3 ± 20.7
−4.1 ± 16.1
−4.2 ± 13.6
Cup-to-disc ratio
()
Mean (SD)
0.9 ± 0.06
0.93 ± 0.06
0.91 ± 0.06
0.87 ± 0.13
Cup-to-disc ratio
<0.9, number (%)
3 (25)
1 (16.7)
4 (22.2)
58 (27.2)
≥0.9, number (%)
9 (75)
5 (83.3)
14 (77.8)
155 (72.8)
Humphrey visual field mean deviation, mean (SD), dB
()
()
()
()
−16.5 ± 7.0
−16.8 ± 17.0
−16.6 ± 8.3
−15.1 ± 8.7
Humphrey visual field mean deviation, dB
<−12, number (%)
6 (66.7)
1 (50)
7 (63.6)
95 (57.9)
≥−12, number (%)
3 (33.3)
1 (50)
4 (36.4)
69 (42.1)
Preoperative split fixation on visual fields‡, number (%)
()
()
()
()
Yes
8 (80)
3 (75)
11 (78.6)
84 (48.8)
No
2 (20)
1 (25)
3 (21.4)
88 (51.2)
Location of quadrants with split fixation†‡, number
Inferonasal
4
3
7
35
Inferotemporal
4
2
6
33
Superonasal
6
3
9
57
Superotemporal
5
2
7
52
Quadrants with split fixation†‡, number (%)
0
2 (20)
1 (25)
3 (21.4)
88 (51.2)
1
3 (30)
0
3 (21.4)
33 (19.2)
2
2 (20)
1 (25)
3 (21.4)
25 (14.5)
3
0
0
0
10 (5.8)
4
3 (30)
2 (50)
5 (35.7)
16 (9.3)
Postoperative choroidal effusions, number
Yes
0
0
0
26 (11.4)
No
12 (100)
6 (100)
18 (100)
203 (88.6)
† indicates variable met inclusion criteria for the model for snuff-out (severe unexplained permanent vision loss). ‡ indicates variable met inclusion criteria for the model for unexplained permanent vision loss (including mild-to-moderate and severe types). Ø indicates variable was perfectly predictive of snuff-out. indicates variable was perfectly predictive of unexplained permanent vision loss. HM = hand motion visual acuity. LP = light perception only visual acuity.
