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00615_Text_Zeisopht 12.txt
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1997-10-28
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449b
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16 lines
ZEISS OPHTHALMOMETER
Making the measurement:
In the center of the hollow cross
there is a dotted line. Each of
the solid marks of the line as
well as each space between the
dots are equivalent to 1.00 D.
This can be used to quickly
estimate the amount of
astigmatism by noting
positioned of the solid cross
on the hollow one after rotating
the instrument without
realigning the crosses.