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Table 2 List of parameters measured by the Pentacam HR System, UHR-OCT and submitted to the neural network classifier for discriminating sub KC and KC corneas from normal healthy corneas

From: Machine learning helps improve diagnostic ability of subclinical keratoconus using Scheimpflug and OCT imaging modalities

Pentacam HR System Parameters   UHR-OCT Parameters
Curvature-Derived Parameters Elevation-Derived Parameters Pachymetry-Derived Parameters Integrated Parameters OCT-Derived Parameters
Anterior surface: Anterior surface: Thinnest point ISV Epithelium Bowman’s Layer Stroma
K1 (Front) Emax (Front) Corneal Volume IHA EPSD BPSD SPSD
K2 (Front) Ecenter (Front)   IVA EPV BPV SPV
Km (Front)    IHD EEI (I/S) BEI(I/S) SEI(I/S)
Kmax (Front)    KI EEI-MAX (I/S) BEI-MAX (I/S) SEI-MAX (I/S)
Posterior surface: Posterior surface:   Rmin EMean (total) BMean (total) SMean (total)
K1 (Back) Emax (Back)   CKI Emean (I) Bmean (I) Smean (I)
K2 (Back) Ecenter (Back)    Emean (S) Bmean (S) Smean (S)
Km (Back)     Emin (I) Bmin (I) Smin (I)
Kmax (Back)     Emax (S) Bmax (S) Smax (S)
  1. UHR-OCT= ultra-high resolution optical coherence tomography; Sub KC= subclinical keratoconus; KC= keratoconus; K1= flattest keratometric reading; K2= steepest keratometric reading; Km= mean keratometric reading; Kmax= maximum keratometric reading; Emax= maximum elevation reading; Emin= minimum elevation reading; Ecenter= corneal central elevation reading; ISV= index of surface variance; IHA= index of height asymmetry; IVA= index of vertical asymmetry; IHD= index of height decentration; KI= keratoconus index; Rmin= smallest radius; CKI= central keratoconus index; EPSD, BPSD, SPSD: standard deviation of thickness profile between individual and normal pattern of epithelium, Bowman’s layer and stroma; EPV, BPV, SPV: profile variation of epithelium, Bowman’s layer or stroma thickness profile within each individual; EEI (I/S), BEI (I/S), SEI (I/S): ectasia index of epithelium, Bowman’s layer or stroma; EEI-MAX (I/S), BEI-MAX (I/S), SEI-MAX (I/S): Maximum ectasia index of epithelium layer, Bowman’s layer or stroma; EMean (total); BMean (total); SMean (total): mean thickness of epithelium, Bowman’s layer or stroma; EMean (I), Bmean (I), Smean (I): mean inferior thickness of epithelium; Bowman’s layer or stroma; EMean (S), Bmean (S), Smean (S): mean superior thickness of epithelium; Bowman’s layer or stroma; Emin (I), Bmin (I), Smin (I): the thinnest thickness of the inferior epithelium; Bowman’s layer or stroma thickness map; Emax(S), Bmax(S), Smax (S): the thickest thickness of the superior epithelium; Bowman’s layer or stroma thickness map