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Table 3 Tomographic parameters of eyes by group

From: Comparisons of corneal biomechanical and tomographic parameters among thin normal cornea, forme fruste keratoconus, and mild keratoconus

Parameters TNC FFKC MKC Statistics P
KmF (D) 43.9 ± 1.4 43.7 ± 1.5 44.3 (41.5–48.5) 3.916 0.141
Kmax (D) 45.1 ± 1.7 45.2 ± 1.9 49.0 (43.8–57.3)#& 45.110 < 0.001
Astig F (D) 1.1 (0.1–4.6) 1.1 (0.1–2.2) 1.5 (0.1–5.2) 2.806 0.246
ISV 18.68 ± 5.83 19.72 ± 5.66 41.00 (17.00–82.00)#& 92.504 < 0.001
IVA 0.11 (0.05–0.35) 0.16 (0.06–0.33) 0.40 (0.16–1.02)#& 90.624 < 0.001
KI 1.03 (0.95–1.07) 1.04 (1.00–1.10) 1.10 (1.00–1.23)#& 76.787 < 0.001
CKI 1.01 (1.00–1.02) 1.01 (1.00–1.04) 1.02 (0.97–1.13)#& 28.187 < 0.001
  1. TNC thin normal cornea; FFKC forme fruste keratoconus; MKC mild keratoconus; KmF mean keratometry from the anterior corneal surface; Kmax maximum keratometry from the anterior corneal surface; Astig F central astigmatism from the anterior corneal surface; ISV index of surface variance; IVA index of vertical asymmetry; KI keratoconus index, CKI central keratoconus index
  2. P is the value among the three groups. *, # and &represent statistically significant difference with TNC and FFKC, TNC and MKC, FFKC and MKC, respectively