Journal of Ophthalmology / 2014 / Article / Tab 2

Clinical Study

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 systemVisante OCT Difference between 2 measurements
Mean ± SDMean ± SDMean ± SD

Stage 1
 TCT ( m)457,63 ± 45,03454,83 ± 41,982,8 ± 13,360,675
 CCT ( m)473,79 ± 43,46478,37 ± 41,02−4,59 ± 14,20,202
 CT 3 mm ( m)502,60 ± 40,86495,62 ± 38,266,98 ± 13,810,121
 CT 5 mm ( m)546,77 ± 40,52526,56 ± 37,8620,21 ± 16,620,186
 CT 8 mm ( m)643,72 ± 46,99598,03 ± 40,0245,69 ± 19,210,225
Stage 2
 TCT ( m)418,04 ± 35,72418,74 ± 36,96−0,7 ± 18,830,788
 CCT ( m)431,26 ± 34,93441,13 ± 38,37−9,87 ± 18,270,685
 CT 3 mm ( m)477,85 ± 31,45470,35 ± 34,967,5 ± 14,090,754
 CT 5 mm ( m)535,36 ± 33,45514,83 ± 35,5220,53 ± 12,440,465
 CT 8 mm ( m)641,05 ± 37,25594,84 ± 35,9646,21 ± 15,20,157
Stage 3
 TCT ( m)410,17 ± 28,27404,17 ± 26,566 ± 10,880,235
 CCT ( m)423,50 ± 29,27421,33 ± 28,662,17 ± 11,960,676
 CT 3 mm ( m)485,75 ± 28,81463,05 ± 26,4122,71 ± 5,520,248
 CT 5 mm ( m)555,47 ± 26,52521,27 ± 24,0534,2 ± 5,390,354
 CT 8 mm ( m)652,49 ± 30,18601,69 ± 17,1150,8 ± 14,270,421
Stage 4
 TCT ( m)353,23 ± 34,77354,69 ± 40,24−1,46 ± 26,560,846
 CCT ( m)380,54 ± 23,34392,15 ± 33,91−11,62 ± 21,360,774
 CT 3 mm ( m)453,62 ± 23,29436,92 ± 23,1516,7 ± 15,030,458
 CT 5 mm ( m)534,60 ± 30,90503,46 ± 28,4831,13 ± 13,280,455
 CT 8 mm ( m)648,28 ± 36,15598,22 ± 33,8850,05 ± 17,110,154
Total
 TCT ( m)435,10 ± 50,90433,63 ± 49,121,46 ± 16,470,254
 CCT ( m)451,09 ± 48,52457,67 ± 47,32−6,58 ± 16,340,847
 CT 3 mm ( m)490,25 ± 39,49481,77 ± 39,918,48 ± 14,20,735
 CT 5 mm ( m)542,49 ± 37,50520,81 ± 36,5521,67 ± 15,250,622
 CT 8 mm ( m)643,54 ± 42,55597,16 ± 37,4946,38 ± 17,620,128

: 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.