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. Author manuscript; available in PMC: 2020 Jun 1.
Published in final edited form as: Am J Ophthalmol. 2019 Feb 15;202:118–125. doi: 10.1016/j.ajo.2019.02.010

Table 1:

Correlations and their significances of keratoconus parameters and Brillouin frequency shifts.

Bthin [GHZ] BMPE[GHz]
Kmax [D] r = −0.20 (p=0.272) r = −0.43 (p=0.039)*
Minimal corneal thickness [μm] r = 0.34 (p=0.056) r = 0.53 (p=0.010)*
Keratoconus index (KI) r = −0.11 (p=0.5663) r = −0.48 (p=0.020)*
Amsler-Krumeich (AK) stage r = −0.16 (p=0.399) r = −0.47 (p=0.023)*

Kmax= maximal keratometry, Bthin = Brillouin frequency shift at the thinnest point of the cornea, BMPE = Brillouin frequency shift at the point of maximum posterior elevation (* indicating significance p<0.05).