back optic zone radius

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optic zone radius, back (BOZR)

Radius of curvature of the back optic zone of a contact lens. (It was formerly called the back central optic radius (BCOR or BC) or posterior central curve radius (PCCR).) If the optic zone is surrounded by a peripheral zone there will be a radius of curvature of a back peripheral zone (BPR). If there are several zones there will be BPR₁, BPR₂, etc., beginning with the zone immediately surrounding the central optic zone. See Drysdale's method; radiuscope; Toposcope.

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Table 1 Summary of lens design parameters with abbreviations, symbols and tolerances from ISO 18369-1:2009, ISO 18369-2:2012 and ISO 18369-3:2006 Parameter Abbreviation Symbol Back optic zone radius BOZR r0 Back or front B/FPR [r.

Verification and identification of contact lenses

a) Back optic zone radius (BOZR) and lens thickness b) Back optic zone radius (BOZR) and back optic zone diameter (BOZD) c) Back optic zone radius (BOZR) and back vertex power (BVP) d) Back optic zone diameter (BOZD) and lens thickness

a) Centre thickness of an RGP contact lens b) Peripheral thickness of an RGP contact lens c) Back optic zone radius of an RGP contact lens d) Back optic zone diameter of an RGP contact lens