Description

Geometry
- Spherical front and back optic zones
- Aspheric flattening
- Front spherical multicurve optic zone
- Distance or Near in center
Multifocal Variations
Bifocal (Bf): two spherical concentric optic zones distant / near
Simple Progressive (Sp): spherical and aspheric concentric zones: distance / intermediate / near
Multi progressive (Mp): multiple spherical concentric zones: distant / near
Materials
Multifocal Variations
Bifocal (Bf)

- 2 concentric Optical zones far/near
- CD or CN
Simple progressive (Sp)

- 3 concentric Optical zones far/ intermediate / near
- CD or CN
Multi progressive (Mp)

- multiple spherical concentric zones: distant / near
- CN
Fitting advice
- Total diameter: = corneal diameter + 2.30 mm
- Base curve: = flattest corneal curve + 0.70 mm
- Sphere: glasses in DVO = 0 mm
- Flattening: comparing the sulcus