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00167_Field_167.txt
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1997-10-28
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23 lines
KERATOMETER MEASURING
TECHNIQUE
Focusing the Mires
Usually the mires are not in sharp focus
when you first locate them. They are
focused by moving the body of the
instrument forward or backward using
the highest knob directly in front of the
examiner. The center ring will appear
double when it is out-of-focus.
If the end of the
focusing range is
reached and the
mires are still not in
focus, the position
of the patient's
head must be
changed (see next
screen).