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00170_Field_170.txt
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1997-10-28
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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.