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00209_Field_209.txt
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1997-10-28
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541b
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OPHTHALMOMETER MEASURING TECHNIQUE
Making the Power Measurement
Once the horizontal lines of the plus signs
are aligned, rotate the horizontal power
drum (on left side) until the vertical lines
of the plus signs are overlapping. Next
rotate the vertical power drum (right side)
until the vertical plus signs overlap. Be
sure to overlap the mires as accurately as
possible. It is often necessary to refocus
the mires during the measurement and
between reading the horizontal and
vertical meridians.