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00206_Field_206.txt
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1997-10-28
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468b
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OPHTHALMOMETER MEASURING TECHNIQUE
Making the Measurement
With the mires centered and in focus,
one is ready to make the measurement.
Rotate the drum on the left (horizontal)
until the horizontal plus signs are just
separated. The horizontal lines of the
plus should be aligned-make a straight
line (on axis). If they are not this
indicates there is corneal toricity at
some axis other than 180 or 90 degrees
(off axis).