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00170_Field_170.txt
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1997-10-29
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496b
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20 lines
KERATOMETER MEASURING TECHNIQUE
Locating the Axis of the Corneal Toricity
The plus signs are aligned by
rotating the body of the
instrument by grasping it by
the large ribbed ring in front
of the eyepiece and rotating
it. Rotate the instrument back
and forth until the horizontal
lines of the plus signs are
aligned.
If there is no astigmatism
the lines will always be
aligned. In this case make
the measurement with the
axes set at 180 and 90.