Diagnostic Capacity of Keratoconus Match Index and Keratoconus Match Probability in Forme Fruste Keratoconus
Primary objective of this study was to evaluate the diagnostic capability of keratoconus match index (KMI) and keratoconus match probability (KMP) indexes in forme fruste keratoconus (FFK), and their association with a series of Pentacam-derived keratconus (KC) indexes. KMI and KMP parameters are KC-specifc indexes that are measured by Ocular Response Analyzer (ORA), based on the distinct ORA-derived waveform characteristics of KC eyes.
Study participants were recruited from the Cornea Outpatient service in a consecutive if eligible basis. Two study groups were formed: a) FFK group (FFKG) that included patients diagnosed with FFK, and, b) Control group (CG) was formed by refractive surgery candidates.
All ORA (Reichert Ophthalmic Instrument, Buffalo, NY, USA, software version: 3.01)and Pentacam (Pentacam HR, Oculus Optikgerate GmbH, Heidelberg, Germany)measurements were performed by the same experienced operator in a consistent way
Forme Fruste Keratoconus (FFK)
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
|Official Title:||Diagnostic Capacity of Keratoconus Match Index and Keratoconus Match Probability in Forme Fruste Keratoconus|
- Keratoconus Match Index (KMI) [ Time Frame: one day ] [ Designated as safety issue: No ]
KMI is the outcome of a neural network calculation of seven ORA-derived waveform scores and represents the similarity of the waveform of the examined eye against the same average waveform scores of the keratoconus eyes in the machine's database.
Receiver operating characteristics (ROC) curves were applied to determine the overall predictive accuracy of KMI parameter,as described by the area under the curve (AUC), in differentiating FFK cases from normal ones. The impact of Pentacam-derived KC related indexes on KMI was assessed with stepwise forward multivariate regression analysis.
|Study Start Date:||November 2011|
|Study Completion Date:||July 2012|
|Primary Completion Date:||June 2012 (Final data collection date for primary outcome measure)|
Forme Fruste Keratoconus Group (FFKG)
Forme Fruste Keratoconus Group (FFKG) included patients diagnosed with FFK.
Control Group (CG)
Control group(CG) was formed by refractive surgery candidates.