crossbows optical freeform software. overview benefits and features designs summary
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Crossbows Optical
Freeform Software
Freeform Software
Overview
Benefits and Features
Designs
Summary
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.
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
Freeform Software
Freeform Software System
SDF: Surface Definition FileLMS: Laboratory Management System FileLDS: Lens Design System File
Freeform Software
Overview
Benefits and Features
Designs
Summary
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
Optical Benefits of Freeform
Accurately reproduces the intended progressive design
Prescription alignment is guaranteed
Prescription accuracy is not limited by tooling steps available in lab.
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
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
Edge Blending
Edge Thickness (mm)Original 4.35Level 1 3.46Level 2 2.78
Front Curve Base 4, Sphere Power -4, Index 1.498
Edge Blending
Centre Thickness (mm)Original 6.72Level 1 6.30
Front Curve Base 9, Sphere Power +8, Index 1.498
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.
Freeform Software
Overview
Benefits and Features
Designs
Summary
Freeform Designs
Single Vision designs
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.
Freeform Designs
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.
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Spherical +4.00 lens Toric +4.00 -2.00 lens
Standard Single Vision lenses
Freeform Designs
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.
Aspheric +4.00 lens Atoric +4.00 -2.00 lens
Custom Single Vision lenses
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Freeform Designs
Progressive designs
Freeform Designs Custom 14 14mm corridor
Cylinder Map Power Map
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2mm
12mm
Addition Inset2.25mm
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Dimensions
• 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.
Freeform Designs Custom 16 16mm corridor
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Cylinder Map Power Map Dimensions
2mm
14mm
Addition Inset2.5mm
• 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.
Freeform Designs Custom 18 18mm corridor
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Cylinder Map Power Map Dimensions
2mm
16mm
Addition Inset2.5mm
• 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.
Freeform Designs Custom U
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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 1.74 indices
Freeform Designs Custom U
Dimensions
4mm
9-14mm
Addition Inset2.5mm
Freeform Designs Custom V
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2.09 2.58
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“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)
Freeform Designs Custom V
Dimensions
4mm
9-14mm
Addition Inset2.5mm
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.
Freeform Designs
Specialist designs
Freeform Designs Custom Office Office Lens
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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.
Freeform Designs Custom Junior Young person’s lens
Cylinder Map Power Map Dimensions
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.
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Freeform Designs Custom Relax Comfort Lens
Cylinder Map Power Map Dimensions
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, 1.586 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.
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Freeform Designs Custom Driver Driving Lens
Cylinder Map Power Map Dimensions
2mm
18mm
Addition Inset2.5mm
• 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.
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Freeform Software
Overview
Benefits
Designs
Summary
Freeform Designs Range Summary
Progressive Designs
Custom 14Custom 16Custom 18
Very good progressive designs to meet most needs
Custom UIncorporates “EyeView” Technology13-18mm corridor lengthAutomatic corridor selection
Custom V
Designed using “Optics First” TechnologyIncorporates “EyeView” Technology13-18mm corridor lengthAutomatic corridor selectionVariable insetPrescription compensation
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 VisionSingle Vision design incorporating “EyeView” Technology
