FlexMax SV
Single vision adapted to frame geometry
Explore design and specificationsIn this design, frame angle, lens-to-eye distance and fitting specifications are included in lens-surface calculations.
Application and design rationale
Frame geometry as part of the calculation
Frame wrap, pantoscopic tilt and BVD can change light propagation. In FlexMax SV, this position of wear is an input to personalised design.
| Design identifier | Description |
|---|---|
| Category | Personalised freeform single vision |
| Design type | Atoric / Fully Compensated Freeform |
Technical specifications
Orderable options depend on prescription, material and current product availability.
| Technical parameter | Value / status |
|---|---|
| Product classMarket Segment | High-end single vision |
| PersonalisationPersonalization | Yes (full) |
| Pre-calibrationPrecalibration | Yes |
| Prism reference pointPrism Reference Point (PRP) | Geometrical centre |
| Available materialsAllowed Materials | All materials |
| Design parameters (required / optional inputs) | Frame and fitting parameters; explained in the measurement section |
| PRP decentration range | 0 to 15 mm |
| Specified indices and options | Refractive indices 1.50 to 1.74 In clear, photochromic and polarised options; confirm final availability when ordering. |
Design mechanism and features
How frame angle affects effective power
Pantoscopic tilt, frame wrap and BVD can affect effective power and oblique-gaze errors. FlexMax SV includes these variables in its atoric freeform surface calculations.
Compensated power and surface design
DuraTrace calculations aim to maintain prescription performance in the actual position of wear. The rear surface is adjusted using fitting data; frame selection and manufacturing limits must still match the prescription and order.
Technologies in this design
- DuraTrace
- Ray-tracing calculations and optical-aberration optimisation in surface design.
Measure before manufacture
Required parameters vary by design and must be recorded by a professional.
- Monocular PD
- Each eye's pupillary distance is recorded separately to align horizontal lens positioning with the visual axis.
- Fitting Height
- Fitting height is recorded on the adjusted frame in the natural position of wear; the required near zone must also fit within the frame.
- BVD
- Distance from the rear lens surface to the corneal apex; relevant to power-compensation calculations in personalised models.
- Pantoscopic Angle
- The frame's vertical tilt in the position of wear must be measured; example values are not substitutes for measurement.
- Wrap Angle
- The horizontal curvature of the frame relative to the face, describing lens positioning.
- Box A
- Horizontal width of the frame opening in the boxing system.
- Box B
- Vertical height of the frame opening in the boxing system.
- DBL
- Distance between the two lens boxes at the frame bridge.
- ED
- Effective diameter: twice the greatest distance from the boxing centre to the lens-shape edge, used for blank selection and edging calculations.
Monocular pupillary distance
For aligning the lens centre with each eye's visual axis.
Fitting height
Vertical pupil position relative to the frame in the position of wear.
Back vertex distance
One of the inputs describing the actual position of wear.
These are basic fitting parameters; additional inputs and the level of personalisation are specified for each model.
Complete parameter guide ↖View the original catalogue page
In this family
UltraMax SV
Single vision personalised to viewing behaviour
Specifications and details
