TruForm Optics
Lenses > Presbyopic Designs > Triune Multifocal
Triune Multifocal
Patent Numbers (US 5,724,120)(US 5,740,707) (US 5,743,159)
Triune Fitting Guide (PDF)
Design
- Translating, segmented lens design
- The intermediate zone is a gradual transition from the full distance power to the full near power
- Recommended to be designed with prism and truncation (truncation is highly recommended for plus power lenses)
Candidates
- Patients requiring sharp distance, functional intermediate, as well as near vision
- Previously adapted rigid lens wearers
- Those patients who require a rigid lens design based on their corneal topography or refraction
Lens Parameters
- Base curves: made to order
- Distance powers: +4.00D to -20.00D
- Near powers: made to order
- Diameters: 8.8mm to 10.0mm
- Materials: use any
Fitting
- Fitting sets are available, lenses can be fit with k readings/refraction/lid measurements.