Scheimpflug Analysis of Patients With Highly Asymmetric Keratoconus
Purpose
To evaluate the efficacy of various Scheimpflug measurements in distinguishing highly asymmetric keratoconus from normal corneas.
Methods
Comparative analysis of Scheimpflug measurements obtained with the Pentacam HR (Oculus, Inc.) between the less affected (also called forme fruste) eye of 15 patients and 100 eyes from 50 control subjects who were deemed to have normal corneas on the basis of multiple screening technologies. Parameters compared included average K, Kmax, central corneal thickness, topometric keratoconus indices, ARTMax, and the BAD-D score from the Belin/Ambrosio display.
Results
Comparative analysis of Scheimpflug measurements obtained with the Pentacam HR (Oculus, Inc.) between the less affected (also called forme fruste) eye of 15 patients and 100 eyes from 50 control subjects who were deemed to have normal corneas on the basis of multiple screening technologies. Parameters compared included average K, Kmax, central corneal thickness, topometric keratoconus indices, ARTMax, and the BAD-D score from the Belin/Ambrosio display.
Conclusion
Highly asymmetric (Forme fruste) keratoconus eyes were thinner than normal corneas but otherwise difficult to distinguish using Scheimpflug imaging. The BAD-D metric failed to identify 40% of forme fruste eyes.