Crossbows Optical Freeform Software

Freeform Software Overview Benefits and Features Designs Summary

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.

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 System SDF: Surface Definition File LMS: Laboratory Management System File LDS: Lens Design System File

Freeform Software Overview Benefits and Features Designs Summary

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.

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

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 1 3.46 Level 2 2.78

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 1 6.30

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.

Standard Single Vision lenses Freeform Designs Standard Single Vision lenses Spherical +4.00 lens Toric +4.00 -2.00 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.

Custom Single Vision lenses Freeform Designs Custom Single Vision lenses Aspheric +4.00 lens Atoric +4.00 -2.00 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.

Freeform Designs Progressive designs

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.

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.

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.

Freeform Designs Custom U 13 14 15 16 17 18

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 1.74 indices

Freeform Designs Custom V 13 14 15 16 17 18

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.

Freeform Designs Specialist designs

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.

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.

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, 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.

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.

Freeform Software Overview Benefits Designs Summary

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

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