The College of Optometrists

Contact lens terms

BC

Base curve

OS/OD

Overall size/overall diameter

BOZD

Back optic zone diameter

OZD

Optic zone diameter

BOZR

Back optic zone radius

PMMA

Polymethyl methacrylate

BVP

Back vertex power

RGP

Rigid gas permeable

CLAPC

Contact lens associated papillary conjunctivitis

SCL

Soft contact lens

CLARE

Contact lens associated red eye

SiH

Silicone hydrogel

CLPU

Contact lens associated peripheral ulcer

SEAL

Superior epithelial arcuate lesion

Dk

Unit of permeability

SLK

Superior limbic keratoconjunctivitis

DW

Daily wear

SPK

Superficial punctate keratitis

EW

Extended wear

SPEE

Superficial punctate epithelial erosions

FOZD

Front optic zone diameter

TBUT

Tear break up time

FVP

Front vertex power

Tc

Centre thickness

HEMA

Hydroxyethyl methacrylate

Td

Total diameter

HT

Handling tint

Te

Edge thickness

HVID

Horizontal visible iris diameter

TWT/WTT

Today wearing time

K

Keratometry

VPA

Vertical palpebral aperture

MWT

Maximum wearing time

WT

Wearing time

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