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Table 1 Main Ocular Parameters (n = 106)

From: Ocular dimensions of the Chinese adolescents with keratoconus

Variables Worse Eyes (n = 53) Fellow Eyes (n = 53) t valuea P value D-value Mean ± SD
Mean ± SD Range Mean ± SD Range
K1 (D) 50.72 ± 7.60 41.40 to 70.70 43.77 ± 2.95 35.50 to 54.30 6.922 < 0.001b 6.95 ± 7.30
K2 (D) 55.56 ± 8.15 43.20 to 74.60 46.38 ± 3.62 41.30 to 56.10 8.614 < 0.001b 9.18 ± 7.75
Kmax (D) 63.79 ± 11.49 45.20 to 86.90 50.03 ± 6.57 42.10 to 69.00 9.791 < 0.001b 13.76 ± 10.23
CCT (μm) 477.5 ± 42.7 377 to 576 515.0 ± 37.5 424 to 587 −8.350 < 0.001b −37.57 ± 32.75
TCT (μm) 459.3 ± 45.8 331 to 541 504.3 ± 39.9 404 to 583 −7.933 < 0.001b −45 ± 41.30
ACD (mm) 3.51 ± 0.32 2.62 to 4.39 3.36 ± 0.29 2.65 to 3.91 4.539 < 0.001b 0.15 ± 0.24
OAL (mm) 24.76 ± 1.24 22.26 to 27.28 24.97 ± 1.40 22.37 to 27.70 −3.120 0.003b −0.21 ± 0.49
ASL (mm) 4.01 ± 0.30 3.19 to 4.88 3.94 ± 0.35 3.19 to 5.46 1.876 0.066 0.07 ± 0.25
PSL (mm) 20.76 ± 1.15 18.58 to 23.26 21.03 ± 1.31 18.50 to 23.54 −4.537 < 0.001b −0.27 ± 0.44
  1. MRSE = manifest refraction spherical equivalent; D = diopter; K1 = flat keratometry value;K2 = steep keratometry value; Kmax = maximum keratometry value; CCT = central corneal thickness; TCT = thinnest corneal thickness, ACD = anterior chamber depth; OAL = optical axial length; ASL = anterior segment length; PSL = posterior segment length
  2. aPaird t-test
  3. bSignificant difference was detected between groups