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00176_Field_176.txt
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1997-10-28
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629b
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KERATOMETER MEASURING TECHNIQUE
Peripheral Readings
Since the cornea has an aspheric
shape, the central readings do
not give information about the
rate of flattening of the cornea
toward the periphery. Different
techniques have been used to
attempt to determine this
peripheral geometry using
keratometry.
One method that has been used
is for the patient fixate to the
side and take measurements in
this position. The patient can be asked to fixate the right and then the left plus sign on the mire on the front of the instrument rather than straight down the objective.