KERATOMETER MEASURING TECHNIQUE

Focusing the Eyepiece

Before taking a measurement, the 
eyepiece should be focused.  By 
holding a white surface before 
the objective (or rotating the 
cover, if it is white, down in front 
of the objective) and looking 
through the eyepiece a cross-hair 
will be seen.  The eyepiece should 
be rotated counter-clockwise 
until the cross-hair blurs, then 
rotated back clockwise until the 
cross-hair just comes into focus.

If different clinicans use the keratometer 
this should be done each time it is used.  
If the same person uses it all the time the 
focus only needs checked periodically.