Comparison Of Simulated K's As Measured By The Humphrey Computerized Videokeratographer To Standard Keratometry.

The accuracy of the simulated K-readings as determined by computerized videokeratographers (CVK's) is critical if using the CVK to calculate residual astigmatism in rigid contact lens fitting or in surgery calculations (IOL or refractive) 1.5. Simulated K 's should correlate well with standard keratome try measurements if the CVK is to be useful for these applications. Several studies have been conducted regarding this correlation using different CVK's. Results have been mixed. A 1994 study demonstrated that simulated K's often differ substantially with keratome try. In the case of the EyeSys, toricity is underestimated by as much as 25% 6.12
This study utilizes the methods from that study to assess the accuracy of the new
Humphrey Systems ATLAS with Master Vue Software. Three front-toric rigid contact lens
buttons were measured with an American Optical radiuscope, a Topcon OM-4 keratometer, and the Humphrey CVK. The results suggest that greater accuracy is possible with this CVK.