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00131_Field_131.txt
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1997-10-29
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19 lines
ALCON HAND HELD AUTO-KERATOMETER
How it works
The four projectors shine a
pattern of 8 green lights on the
cornea which the examiner uses
to align the instrument for
measurement.
There is a red fixation light which
projects along the optical axis
of the instrument and out the
central projection window onto
the cornea. This light is not only
for the patient to fixate on, but
also an alignment target for the
examiner.