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00172_Field_172.txt
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1997-10-28
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653b
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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.