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00048_Field_48.txt
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1997-10-28
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LENS DESIGN
OVERALL DIAMETER
The outside diameter of the lens is
called the overall diameter (OAD) or
overall size (OS).
The OAD is specified in millimeters.
For rigid corneal lenses the OAD is
usually in the range of 8.0 mm to 11.0 mm.
For hydrogel lenses it is 12.0 mm to 16.0 mm.