1. Crossbows Optical
Freeform Software

2. Freeform Software
Overview
Benefits and Features
Designs
Summary

3. Freeform Software
An exciting and extensive range of premium progressive designs which will suit most frame sizes, shapes and fitting heights
Progressive design on the back surface incorporates patients prescription and maximises fields of view
Available in a very wide range of corridor lengths and indices
Only requires a stock of semi-finished spheres in each index which can be purchased from any reliable quality source
All quoted corridor lengths are from the fit point to 100% of addition power
Includes a range of specialist progressive designs for office use, comfort, children and driving.

4. Freeform Software
Also includes a range of single vision Aspheric and Atoric designs which provide sharp vision at all viewing angles
All designs offer the patient excellent comfort and fast adaptation
Software can be integrated with most VC (Vision Council) compatible laboratory software environments
File outputs are suitable for a wide range of freeform equipment
Proven design success – not only as evidenced by Crossbows own freeform customers but Crossbows also supplies its parent company, Signet Armorlite Inc, with the software and designs for their extensive range of Kodak and own- branded freeform progressive lenses

5. Freeform Software System
SDF: Surface Definition File
LMS: Laboratory Management System File
LDS: Lens Design System File

6. Freeform Software
Overview
Benefits and Features
Designs
Summary

7. Optical Benefits of Freeform
Progressive on the back surface to maximize fields of view in the corridor and reading areas.
Front surface progressive field of view
Back surface progressive field of view
Accurately reproduces the intended progressive design
Prescription alignment is guaranteed
Prescription accuracy is not limited by tooling steps available in lab.

8. Freeform Software Features
EyeView Technology improves lenses for real life viewing
This is possible because ophthalmic lenses have oblique power errors which are present when viewing away from the optical centre of the lens.
EyeView technology uses specially developed software which incorporates the results of raytracing over the entire lens to correct for these errors. Back Vertex Distance and Pantoscopic Tilt are used in these complex calculations.
Can use circular or elliptical crib shapes to reduce lens thickness
Allows variable decentration to further reduce thickness
Controls minimum thickness for rimless frames
Special curve control in reading area resulting in flatter lenses
Allows blocked prism, surface prism or a combination of both

9. Freeform Software Features
As worn prescription compensation
The software adjusts the
Sphere
cylinder
axis
of the prescription to take into account the individual’s
pantoscopic tilt
face bow (or wrap angle)
back vertex distance
Variable inset
Optional edge blending for high powers
Central circular aperture unchanged
Available on both single vision and progressives
Edge thickness benefit on minus lenses
Centre thickness benefit on plus lenses
Limited by generator cutter radius on plus lenses
Variable aperture diameter
Two levels of blending: Level 1 - Moderate Level 2 - High

10. Front Curve Base 4, Sphere Power -4, Index 1.498
Edge Blending
Front Curve Base 4, Sphere Power -4, Index 1.498
Edge Thickness (mm)
Original 4.35
Level
Level

11. Front Curve Base 9, Sphere Power +8, Index 1.498
Edge Blending
Front Curve Base 9, Sphere Power +8, Index 1.498
Centre Thickness (mm)
Original 6.72
Level

12. Operational Benefits of Freeform
Ability to produce designs in any material index
Ability to change design by software update
Ability to custom engrave semi-visible markings on lenses
Prescription prism.

13. Freeform Software
Overview
Benefits and Features
Designs
Summary

14. Freeform Designs
Single Vision designs

15. Freeform Designs Custom Single Vision
Custom Single Vision Lenses minimise unwanted astigmatism associated with conventional single vision lenses.
The combination of a spherical front surface and a freeform aspherical or atoric design on the back results in a lens with superior optical performance not only on the horizontal and vertical axes but over the entire lens surface.
There are also benefits to be gained both in terms of thickness and cosmetic appearance as flatter base curves can be used without sacrificing optical performance.

16. Standard Single Vision lenses
Freeform Designs
Standard Single Vision lenses
Spherical lens
Toric lens
This analysis shows the unwanted astigmatism of two different single vision lenses, one spherical and one toric over a range of gaze angles.
Once the eye moves away from the central viewing position and looks obliquely through the lens, unwanted astigmatism is present.

17. Custom Single Vision lenses
Freeform Designs
Custom Single Vision lenses
Aspheric lens
Atoric lens
When the same analysis is done on Custom Single Vision Lenses, nearly all of the unwanted astigmatism that was in the standard single vision lenses is no longer present. This reduction in aberration is achieved not only on the horizontal and vertical axes but over the entire lens surface. The differences are particularly marked towards the periphery of the lens compared with the conventional single vision lenses.

18. Freeform Designs
Progressive designs

19. Freeform Designs Custom 14 14mm corridor
Cylinder Map
Power Map
Dimensions
2mm
12mm
Addition Inset
2.25mm
Short corridor (14mm to full addition power)
Minimum fitting height of 15mm
Low distortion soft, aspheric design
Individual designs for left and right eyes
Available in 1.498, 1.56, 1.586, 1.60, 1.67 and 1.74 indices
The Custom 14 progressive is designed specifically for frames with small eye sizes. This is achieved in a soft design without compromising the distance, corridor and reading areas.

20. Freeform Designs Custom 16 16mm corridor
Cylinder Map
Power Map
Dimensions
2mm
14mm
Addition Inset
2.5mm
16mm corridor length to full addition power
Minimum fitting height of 17mm
Low distortion soft, aspheric design
Individual designs for left and right eyes
Available in 1.498, 1.56, 1.586, 1.60, 1.67 and 1.74 indices
Custom 16 successfully combines a soft design with wide distance, intermediate and reading areas. This design also benefits from having low rates of change of mean power yet maintains good dynamic vision throughout.

21. Freeform Designs Custom 18 18mm corridor
Cylinder Map
Power Map
Dimensions
2mm
16mm
Addition Inset
2.5mm
Low distortion soft design
Minimum fitting height of 19mm
Wide usable corridor
Individual designs for left and right eyes
18mm corridor length to full addition power
Available in 1.498, 1.56, 1.586, 1.60, 1.67 and 1.74 indices
The Custom 18 design with its low rates of change and levels of astigmatism provides good dynamic vision combined with generous intermediate and reading areas. Maximum astigmatism is located on the nasal side where most of it will be edged away.

22. Freeform Designs Custom U13 14 15 16 17 18

23. Freeform Designs Custom U
Dimensions
4mm
9-14mm
Addition Inset
2.5mm
Incorporates “Eye View” technology
Low distortion soft, aspheric design
Variable corridor lengths (13mm to 18mm)
Automatic corridor length selection based on frame shape and patients fitting details
Minimum fitting height of 14mm (with 13mm corridor design)
Available in 1.498, 1.56, 1.586, 1.60, 1.67 and indices

24. Freeform Designs Custom V13 14 15 16 17 18

25. Freeform Designs Custom V
Dimensions
4mm
9-14mm
Addition Inset
2.5mm
“Optics First” design technology
Incorporates “Eye View” technology
Smooth mean power distribution
Soft design with low distortion
Prescription compensation for as worn condition
Variable inset
Automatic corridor length selection based on frame shape and patients fitting details
Minimum fitting height of 14mm (with 13mm corridor design)
Custom V has been designed using Crossbows latest “Optics First” design system. This radical approach reverses the normal design process and has allowed Custom V to be designed from the outset with a very smooth mean power profile, thus minimizing swim effects and providing excellent patient comfort and rapid adaptation.

26. Freeform Designs
Specialist designs

27. Freeform Designs Custom Office Office Lens
Cylinder Map
Power Map
Dimensions
Reading Inset 2.4mm
14mm
Fit Point
A superior design of office progressive lens
Low distortion, soft design
4 Dynamic powers available
Designs in 1.498, 1.56 and 1.60 indices
The Custom Office design is a lens designed primarily for use in an office-type environment. It is not a traditional progressive design, but rather is an alternative to a reading lens, providing clear vision for reading and intermediate viewing. The wide range of dynamic powers allows the ideal choice to be made for all reading additions up to 3.00D and also allows the user to benefit from fully corrected reading and intermediate vision and maximised distance vision. The design reduces eye and neck strain associated with long term use of computers.

28. Freeform Designs Custom Junior Young person’s lens
Cylinder Map
Power Map
Dimensions
2.25
Short Corridor (13mm to full addition power)
Minimum fitting height of 14mm
Individual designs for left and right eyes
Available in 1.498, 1.56, 1.60 and 1.67 indices
The Custom Junior progressive is designed specifically to help reduce the onset of myopia in young people between the ages of 8 and 16 years. The design offers a large stable reading area combined with excellent peripheral clarity in the distance zone.

29. Freeform Designs Custom Relax Comfort Lens
Cylinder Map
Power Map
Dimensions
2.5
Very soft design with very low distortion
Distortion free distance area and corridor
Individual designs for left and right eyes
14mm corridor length to full addition power
Available in 1.498, 1.53, 1.56, and 1.67 indices
The Custom Relax design is a progressive design for people who are not presbyopic. It avoids the patients’ eyes becoming tired and strained if they spend a large portion of the day focusing at the same distance, e.g. using a computer. It is available in two forms; Custom Relax I has an addition of 0.66D, Custom Relax II has an addition of 1.00D.

30. Freeform Designs Custom Driver Driving Lens
Cylinder Map
Power Map
Dimensions
2mm
18mm
Addition Inset
2.5mm
Wide clear distance area
Wide clear corridor
Low unwanted astigmatism
Individual designs for left and right eyes
20mm corridor length to full addition power
Available in 1.498, 1.56, 1.60 and 1.67 indices
The Custom Driver has been designed with the specific vision requirements of driving in mind. Clear distance vision is the absolute priority with improved middle distance vision compared to other progressive designs for reading the dashboard and seeing in mirrors.

31. Freeform Software
Overview
Benefits
Designs
Summary

32. Freeform Designs Range Summary
Progressive Designs
Custom 14
Custom 16
Custom 18
Very good progressive designs to meet most needs
Custom U
Incorporates “EyeView” Technology
13-18mm corridor length
Automatic corridor selection
Custom V
Designed using “Optics First” Technology
Variable inset
Prescription compensation

33. Freeform Designs Range Summary continued
Specialist Progressive Designs
Custom Office
For computer and other occupational uses
Custom Junior
To help reduce onset of myopia in children
Custom Relax
To reduce visual fatigue in non-presbyopes
Custom Driver
For the specific requirements of driving
Single Vision Designs
Custom Single Vision
Single Vision design incorporating “EyeView” Technology