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00182_Field_182.txt
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1997-10-29
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CALIBRATION OF THE
KERATOMETER
Mounting the Units on the Instrument
The stem that holds the calibration balls
clamps onto the headrest of the instrument
with a thumb screw. It should be mounted
as far up on the headrest as possible
without getting onto the curved portion.
Rotate it in towards the objective of the
instrument so the ball is at about the
location where the patientΓÇÖs eye would be.
The tendency is to have it too far away
from the objective where it is impossible
to get it in focus.
With the single bar type of calibration unit,
it is either held in place by magnets onto
the headrest or clamps onto the head rest.
Again position it as close to where the
patientΓÇÖs eye level would be as possible.