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Keratom.DIr
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00610_Field_610.txt
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1997-10-29
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515b
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17 lines
ZEISS OPHTHALMOMETER
Making the measurement:
If the cornea is toric, the two crosses
will not appear to be on the same axis.
In this case the body of the instrument
must be rotated until they appear on the
same axis. The power is then measured
as before with the central screw in the
handle. The axis is read in the left
window (1) in the instrument. The body of
the instrument must then be rotated
90 degrees to measure
the second principal
meridian.