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Diagnostic capacity of the keratoconus match index and keratoconus match probability in subclinical keratoconus
Georgios Labiris1, Athanassios Giarmoukakis1, Zisis Gatzioufas1
1From the Department of Ophthalmology (Labiris, Gatzioufas, Seitz), University Medical Center of Saarland UKS, Homburg/Saar, Germany; the Eye Institute of Thrace (Labiris, Giarmoukakis, Sideroudi, Kozobolis), Alexandroupolis, Greece.
Purpose:
To evaluate the diagnostic capacity of the Ocular Response Analyzer's keratoconus match index (KMI) and keratoconus match probability (KMP) classification in keratoconus-suspect eyes.
Setting:
Department of Ophthalmology, University Clinics Saarland, Homburg, Germany.
Design:
Comparative case series.
Methods:
The KMI and KMP parameters in keratoconus-suspect eyes and normal eyes (control group) were compared. The quantitative keratoconus percentage index was calculated for all suspect eyes. According to the thinnest corneal thickness (TCT), keratoconus-suspect eyes were divided into 2 subgroups: subgroup 1 (TCT <520 μm) and subgroup 2 (TCT >520 μm). The KMI's overall predictive accuracy was assessed using receiver operating characteristic (ROC) curves. The relationship between KMI and a series of Scheimpflug-derived keratoconus-related indices was evaluated using Spearman analysis.
Results:
The mean KMI was 0.41 ± 0.29 (SD) in the keratoconus-suspect group (50 eyes) and 0.94 ± 0.29 in the control group (50 eyes) (P<.001). Nonsignificant KMI differences were detected between the keratoconus-suspect subgroups (subgroup 1, 27 eyes; subgroup 2, 23 eyes) (P=.059). Nonsignificant correlations were found between Scheimpflug indices and the KMI. The KMP identified 27.65% of control eyes as keratoconus suspect and 10.71%, 28.57%, and 3.57% of keratoconus-suspect eyes as being normal, having mild keratoconus, or having moderate keratoconus, respectively. The ROC analysis for the KMI indicated a predictive accuracy of 94% (cutoff point 0.72).
Conclusions:
The KMI seems to be a valuable index in the early diagnosis of keratoconus-suspect eyes. The KMP identified a significant percentage of topographically defined keratoconus-suspect eyes as normal or keratoconic.
Financial Disclosure:
No author has a financial or proprietary interest in any material or method mentioned.
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