Evaluation of Pachymetric Measurements with Scheimpflug Photography-Based System and Optical Coherence Tomography Pachymetry at Different Stages of Keratoconus
Table 2
Comparative analysis of the Sirius system and the Visante OCT measurements in different stages of keratoconus.
Measurement localizations
Sirius system
Visante OCT
Difference between 2 measurements
Mean ± SD
Mean ± SD
Mean ± SD
Stage 1
TCT (m)
457,63 ± 45,03
454,83 ± 41,98
2,8 ± 13,36
0,675
CCT (m)
473,79 ± 43,46
478,37 ± 41,02
−4,59 ± 14,2
0,202
CT 3 mm (m)
502,60 ± 40,86
495,62 ± 38,26
6,98 ± 13,81
0,121
CT 5 mm (m)
546,77 ± 40,52
526,56 ± 37,86
20,21 ± 16,62
0,186
CT 8 mm (m)
643,72 ± 46,99
598,03 ± 40,02
45,69 ± 19,21
0,225
Stage 2
TCT (m)
418,04 ± 35,72
418,74 ± 36,96
−0,7 ± 18,83
0,788
CCT (m)
431,26 ± 34,93
441,13 ± 38,37
−9,87 ± 18,27
0,685
CT 3 mm (m)
477,85 ± 31,45
470,35 ± 34,96
7,5 ± 14,09
0,754
CT 5 mm (m)
535,36 ± 33,45
514,83 ± 35,52
20,53 ± 12,44
0,465
CT 8 mm (m)
641,05 ± 37,25
594,84 ± 35,96
46,21 ± 15,2
0,157
Stage 3
TCT (m)
410,17 ± 28,27
404,17 ± 26,56
6 ± 10,88
0,235
CCT (m)
423,50 ± 29,27
421,33 ± 28,66
2,17 ± 11,96
0,676
CT 3 mm (m)
485,75 ± 28,81
463,05 ± 26,41
22,71 ± 5,52
0,248
CT 5 mm (m)
555,47 ± 26,52
521,27 ± 24,05
34,2 ± 5,39
0,354
CT 8 mm (m)
652,49 ± 30,18
601,69 ± 17,11
50,8 ± 14,27
0,421
Stage 4
TCT (m)
353,23 ± 34,77
354,69 ± 40,24
−1,46 ± 26,56
0,846
CCT (m)
380,54 ± 23,34
392,15 ± 33,91
−11,62 ± 21,36
0,774
CT 3 mm (m)
453,62 ± 23,29
436,92 ± 23,15
16,7 ± 15,03
0,458
CT 5 mm (m)
534,60 ± 30,90
503,46 ± 28,48
31,13 ± 13,28
0,455
CT 8 mm (m)
648,28 ± 36,15
598,22 ± 33,88
50,05 ± 17,11
0,154
Total
TCT (m)
435,10 ± 50,90
433,63 ± 49,12
1,46 ± 16,47
0,254
CCT (m)
451,09 ± 48,52
457,67 ± 47,32
−6,58 ± 16,34
0,847
CT 3 mm (m)
490,25 ± 39,49
481,77 ± 39,91
8,48 ± 14,2
0,735
CT 5 mm (m)
542,49 ± 37,50
520,81 ± 36,55
21,67 ± 15,25
0,622
CT 8 mm (m)
643,54 ± 42,55
597,16 ± 37,49
46,38 ± 17,62
0,128
: paired samples -test, SD: standard deviation. CCT: central corneal thickness, TCT: thinnest corneal thickness, CT 3 mm: corneal thickness at 3 mm, CT 5 mm: corneal thickness at 5 mm, and CT 8 mm: corneal thickness at 8 mm.
