Repeatability and Reproducibility of Retinal Nerve Fiber Layer Parameters Measured by Scanning Laser Polarimetry with Enhanced Corneal Compensation in Normal and Glaucomatous Eyes
Table 2
SLP parameters for the five tests performed in the normal and glaucoma groups.
Control ( = 82)
Glaucoma ( = 60)
Min.
Max.
Mean
SD
Min.
Max.
Mean
SD
Intravisit measurements
First measurement
NFI
2
48
19.26
8.52
2
98
48.25
30.97
<0.001
TSNIT average
37.4
65.4
51.18
4.76
25.8
58.3
41.91
8.54
<0.001
Superior average
46.6
77.8
62.29
6.50
3.1
70.2
46.85
13.56
<0.001
Inferior average
45.9
87.4
63.83
7.31
26.2
76.2
52.46
11.96
<0.001
TSNIT SD
15
34.1
24.48
3.76
8.9
29.3
19.30
5.79
<0.001
Second measurement
NFI
3
58
19.04
9.48
2
98
49.35
31.17
<0.001
TSNIT average
40
69
51.04
4.88
17
58
41.85
8.95
<0.001
Superior average
46
84
62.26
7.20
15
72
47.78
12.70
<0.001
Inferior average
49
79
63.58
6.94
13
76
51.27
13.61
<0.001
TSNIT SD
15
33
24.49
3.69
6
31
19.28
6.32
<0.001
Third measurement
NFI
3
44
18.87
8.48
5
98
46.90
30.03
<0.001
TSNIT average
43
61
51.18
4.26
24
58
42.57
8.58
<0.001
Superior average
50
79
62.19
6.14
23
74
49.25
12.38
<0.001
Inferior average
52
79
63.99
6.68
26
76
52.88
12.06
<0.001
TSNIT SD
17
32
24.68
3.46
8
32
19.65
5.74
<0.001
Intervisit measurements
Fourth measurement
NFI
2
42
15.94
9.47
6
98
47.59
32.09
<0.001
TSNIT average
43
63
52.58
5.01
25
56
41.95
8.82
<0.001
Superior average
50
80
64.73
8.07
23
69
48.66
13.13
<0.001
Inferior average
53
82
65.92
7.23
28
73
51.93
12.37
<0.001
TSNIT SD
17
36
25.65
4.11
9
29
19.55
6.21
<0.001
Fifth measurement
NFI
2
64
18.19
11.84
3
98
49.98
31.23
<0.001
TSNIT average
41
61
51.54
5.01
23
59
40.89
8.90
<0.001
Superior average
49
80
62.47
7.38
20
75
47.36
13.83
<0.001
Inferior average
48
83
64.90
7.80
27
72
50.91
12.28
<0.001
TSNIT SD
13
36
24.77
4.42
7
30
18.86
6.28
<0.001
Student’s -test between the control and glaucoma groups. Min.: minimum; Max.: maximum; NFI: nerve fiber indicator; TSNIT: temporal-superior-nasal-inferior-temporal; SD: standard deviation.
