CALIBRATION OF THE KERATOMETER

Units Available For Calibraton

The keratometer should be 
checked when first purchased 
and then periodically to be sure 
you are obtaining accurate 
readings.   

Prior to the actual calibration 
procedure you must first focus 
the eyepiece.  If you do not 
know how to do this click here.

To calibrate the instrument you 
need a set of calibration balls 
(ball bearings) or at least one 
calibration ball.  A standard set of three balls, with radii that give readings of 40.50 D., 42.50 D. and 44.75 D., is shown, as is another calibration unit with just one 42.50 D. surface.