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Keratom.DIr
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00181_Field_181.txt
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1997-10-29
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649b
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20 lines
CALIBRATION OF THE KERATOMETER
Units Available For Calibraton
The keratometer should be
checked when first purchased
and then periodically to be sure
you are obtaining accurate
readings.
Prior to the actual calibration
procedure you must first focus
the eyepiece. If you do not
know how to do this click here.
To calibrate the instrument you
need a set of calibration balls
(ball bearings) or at least one
calibration ball. A standard set of three balls, with radii that give readings of 40.50 D., 42.50 D. and 44.75 D., is shown, as is another calibration unit with just one 42.50 D. surface.