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00172_Field_172.txt
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1997-10-29
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642b
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KERATOMETER MEASURING TECHNIQUE
Modification of the Mires
The mire can be modified to make it easier to determine when the mires are properly overlapped and give better repeatability. The center of the one plus sign can be
blacked out and the extent of the other
one decreased on the mire object plate
(on the front of the instrument). This
allows the plus signs to be aligned using
vernier acuity which is more accurate
than just overlapping the plus signs. The
mires are moved until a full plus sign is
formed. Likewise, the center of one
minus sign can be blacked out and the
other one shortened.