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00168_Field_168.txt
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1997-10-28
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521b
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20 lines
KERATOMETER MEASURING TECHNIQUE
Focusing the Mires
The headrest can be moved
forward or backward with the
small knob just below the
patient's chin. Turn the knob
clockwise to move the patient's
head back (when the focus
control was all the way back
towards the examiner and the
mires still not in focus) and
counter-clockwise to bring the
forehead forward towards the
instrument (when the focus control
was all the way forward and the mires
were still not in focus).