Contents page Introduction 2 Features and Benefits 3 Freeform Design Range Custom 14/16/18 13 Custom U 1 Custom V 17 Custom Office 19 Custom Driver Custom Relax 21 Custom Junior 22 Custom Blended Bifocal 23 Custom Single Vision 24 Summary tables
Freeform Software Crossbows can provide freeform software for the production of finished progressive lenses from semi-finished spheres where the progressive surface is machined on the concave side and incorporates the patient s prescription. File outputs can be generated for a range of freeform equipment including machinery from Schneider, Optotech, Satisloh, Gerber Coburn, DAC, Comes and also VCA standard output. The software has the ability to be integrated with VCA compliant Lab Management Systems. Different designs are available to suit a wide variety of frame sizes and patients needs. The corridor lengths are measured from fit point to the centre of the reading reference circle i.e. to % of full add power, unlike some of our competitors. The Crossbows freeform software is simple to use and can be run in two different modes. It can act as a standalone program which can provide a simple interface for entering freeform prescriptions and will produce output files for the machines mentioned above. It can also be run as a server program and this can be integrated with a suitable Laboratory Management System to function automatically. The software is compliant with latest VCA freeform standards. 2
Features and Benefits of Crossbows Freeform Software 3
Smooth Optics Smooth Optics introduces a new generation of sophisticated lens designs providing exacting standards of vision for the discerning progressive lens wearer. It is a radical approach which reverses the normal design process and has allowed the lens design to be created from the outset with a very smooth mean power profile. Provides premium progressive lens design with superior comfort Allows for natural eye movement Provides sharp viewing in any direction Minimizes blurring or swim effect experienced with traditional progressive designs Results in faster patient adaptation times and greater patient satisfaction without Smooth Optics with Smooth Optics 3 1 - - -1-3 1 - - -1 - - -3-3 - - -1 - - 1 3 - -3-3 - - -1 - - 1 3 Mean Power Maps 4
EyeView 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. Standard values of back vertex distance and pantoscopic tilt are used in these complex calculations. More consistent optical performance over the range of prescription powers Wider viewing areas for hyperopes (plus prescriptions) Improved distance area for myopes (minus prescriptions) Improved image quality in principal viewing areas Surface analysis Raytrace of design without Eyeview Raytrace of design with Eyeview Cylinder Maps
Prescription compensation Prescription Compensation is an extension of the EyeView principles, were an individual s back vertex distance, pantoscopic tilt and face bow are used to adjust the sphere, cylinder and axis of the prescription to give the best as worn condition possible. This involves using a complex model of how the eye looks through the lens. 6
Edge Blending Edge Blending allows an improvement in the cosmetic appearance of higher powered minus lenses by flattening their outer edges and making them lighter and thinner. Central circular aperture unchanged Edge thickness benefit Variable aperture diameter Two levels of blending: Level 1 - Moderate, Level 2 - High without edge blending with edge blending 7
Other features Can use circular or elliptical crib shapes to reduce lens thickness Allows variable decentration to further reduce thickness blank size without decentration blank size with decentration 8
Special curve control in reading area resulting in flatter lenses without special curve control Prescription: +. / 3. addition with special curve control Allows blocked prism, surface prism or a combination of both Controls minimum thickness for rimless frames Variable inset depending upon the Near distance, Lens Power, BVD and MPD 9
Freeform Design Range
Progressive Designs Custom 14 Custom 16 Custom 18 Custom U Custom V Very good progressive designs to meet most needs Incorporates EyeView Technology 13-18mm corridor length Automatic corridor selection Designed using Smooth Optics Technology Incorporates EyeView Technology 13-18mm corridor length Automatic corridor selection Variable inset Prescription compensation Lifestyle Progressive Designs Custom Office Custom Driver Custom Relax Custom Junior For computer and other occupational uses For the specific requirements of driving To reduce visual fatigue in non-presbyopes To help reduce onset of myopia in children Bifocal Design Custom Blended Bifocal Large distance and reading areas with no obvious segment line Single Vision Designs Custom Single Vision Single Vision design incorporating EyeView Technology 11
Gold package includes Silver products Platinum package includes Silver and Gold products 12
Custom 14/16/18 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. The 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. 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. Corridors of 14, 16 and 18mm full addition power Minimum fitting height of 1mm (on Custom 14) Low distortion soft, aspheric designs Individual designs for left and right eyes Available in 1.498, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions 13
Custom 14/16/18 Cylinder Map Power Map Custom 14 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 Custom 16 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 Custom 18 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 14
Custom U For the more discerning patient. EyeView technology provides greater comfort, faster adaptation and sharper all over vision. Automatically chooses the most suitable corridor length 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, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions 1
3 1 Custom U Cylinder Map 3 1 Power Map Custom U13 Custom U14 Custom U1 Custom U16 Custom U17 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 Custom U18 1 - - 1 - - -1 - - -3-3 - - -1 - - 1 3-1 - - -3-3 - - -1 - - 1 3 16
Custom V Custom V has been designed using Crossbows latest Smooth Optics 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. Smooth Optics 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) Dimensions 17
Custom V 3 Cylinder Map 3 Power Map Custom V13 Custom V14 Custom V1 Custom V16 Custom V17 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 Custom V18 1 - - -1-1 - - -1 - - -3-3 - - -1 - - 1 3 - -3-3 - - -1 - - 1 3 18
Custom Office 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.D 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. A superior design of office progressive lens Low distortion, soft design 8 Dynamic powers available Designs in 1.498, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions Cylinder Map Power Map 3 1 3 1 - - -1 - - -3-3 - - -1 - - 1 3 - - -1 - - -3-3 - - -1 - - 1 3 19
Custom Driver 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. Wide clear distance area Wide clear corridor Low unwanted astigmatism Individual designs for left and right eyes Available in 1.498, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions Cylinder Map Power Map 3 1 3 1 - - -1 - - -3-3 - - -1 - - 1 3 - - -1 - - -3-3 - - -1 - - 1 3
Custom Relax 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.66d, Custom Relax II has an addition of 1.D. 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, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions Cylinder Map Power Map 21 3 1 - - -1 - - -3-3 - - -1 - - 1 3 3 1 - - -1 - - -3-3 - - -1 - - 1 3
Custom Junior 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. Short Corridor (13mm to full addition power) Minimum fitting height of 14mm Individual designs for left and right eyes Available in 1.498, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions 3 Cylinder Map 3 Power Map 1 - - -1 - - 2.19 2.3 1 - - -1 - - -3-3 - - -1 - - 1 3-3 -3 - - -1 - - 1 3 22
Custom Blended Bifocal The Custom Blended Bifocal design is a bifocal but without the obvious line around the reading segment. The power changes from the distance prescription to the reading prescription over a small region which makes the bifocal segment almost invisible. This results in exceptionally wide and large distance and reading areas compared to progressive lenses. Choice of segment diameter Choice of segment position Choice of blended region width Addition powers from 1. to 3. dioptres Prescription is incorporated into bifocal surface Available in 1.498, 1.3, 1.6, 1.86, 1.6, 1.67 and 1.74 indices Dimensions Blended region width Segment vertical position Segment diameter Inset Power Map 23
Custom Single Vision Custom Single Vision Lenses, using EyeView technology, minimise unwanted astigmatism associated with conventional single vision lenses. Standard Single Vision lenses 3 3 - - - - -3-3 -3 - - 3-3 - - 3 Spherical +4. lens Toric +4. -2. lens Custom Single Vision lenses 3 3 - - - - -3-3 -3 - - 3-3 - - 3 Spherical +4. lens Toric +4. -2. lens 24
Range at a glance Silver Gold Platinum Custom 14 Custom 16 Custom 18 Custom U Custom V Custom Office Custom Driver Custom Relax Custom Junior Custom Blended Bifocal Custom Single Vision
Features at a glance Custom 14, 16, 18 Custom U Custom V Custom Lifestyle Custom Blended Bifocal Custom Single Vision Variable design decentration Prescription prism by blocking Prescription prism by machining Prescription prism by combination of blocking/machining Thickness control for rimless frames Circular or elliptical crib shapes Edge blending Plate height reduction EyeView technology As worn prescription compensation Manual variable inset Automatic variable inset Smooth Optics technology 26
Parameters at a glance Custom 14, 16, 18 Custom U Custom V Custom Lifestyle Custom Blended Bifocal Custom Single Vision Prescription data Frame box data Frame trace Distance between lens Monocular PD Fitting Height Pantoscopic tilt standard Pantoscopic tilt individual Face bow angle standard Face bow angle individual Back vertex distance standard Back vertex distance individual 27
CROSSBOWS OPTICAL LTD Unit 1 Halfpenny Valley Industrial Estate Lurgan Tel: +44 28 3832 231 Craigavon Fax: +44 28 3832 8923 Co Armagh www.crossbowsoptical.com BT66 8TP general@crossbowsoptical.com