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00159_Field_159.txt
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1997-10-28
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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.