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00051_Field_51.txt
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1997-10-29
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634b
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LENS DESIGN
BACK OPTIC ZONE
When viewed through the lens (from
the front or back of the lens) the
section formed by the base curve is
called the optical zone or back
central optic. The diameter of this
portion of the lens is called the
optical zone diameter (OZD);
posterior optic zone diameter (POZD);
or back central optic diameter (BCOD).
It is the linear distance from one edge
of this zone to the other edge. Optic zone diameters for rigid lenses are typically 7.5 to 8.5 mm. This is the portion of the lens that the patient looks through and has the patientΓÇÖs correction.