Presentation on theme: "FreeForm® Progressives Welcome. What is free-form? Digital FreeForm lenses vs. conventional lenses."— Presentation transcript:
FreeForm® Progressives Welcome
What is free-form? Digital FreeForm lenses vs. conventional lenses
General information about the technology Not hard tools needed anymore How precise the technology can be What can be done by advanced ophthalmic design and FF technology? Free-form can produce any ophthalmic lens type
General information about the technology Free form is a manufacturing technology that allows cutting and polishing arbitrary surfaces A lens is free-form if –At least one of its surfaces is made with free form technology and –That surface is not spherical neither torical* *Free form machines may cut standard surfaces, but as they can also be cut with standard methods, the corresponding lenses should not be named free-form lenses.
FreeForm surfacing Blocking Generating Polishing De-blocking Flexible tool Diamond cutter/sintered diamond milling tool Not hard tools needed anymore
How precise the technology can be What is claimed: 0.01 D Very difficult to achieve in plastic Well tuned process with tools, soft pads and slurries not worn out, guarantees better precision than standard milling and polishing methods.
What can be done by advanced ophthalmic design and FF technology? Optimize the lens for the power that the user perceives, not the power measured in the focimeter (which is ok for quality control, but is not the power perceived by the user) Optimize the lens for any position of use (tilts, distance to the eye, etc…) Optimize the lens for any base curve (the spherical base curves used with FF lenses) Optimize the lens for each prescription Optimize the lens for particular applications Better control of lens thickness Off-centering without losing optical quality ….. …Important improvement to the optical quality of standard lenses
Free-form can produce any ophthalmic lens type
Formation of distortion in progressive lenses
Formation of distortion in progressive lenses
Distortion in Progressive Lenses
Wider visual field in Backside PAL Free Form progressive offers %30 wider visual field compared to conventional progressive thanks to the progressive surface on the backside of the lenses.
Comparision between FreeForm and Conventional PAL Conventional Based on the geometry of the lens to calculate the power resulted Enhanced view mainly in the central gaze direction Small degree of lateral unwanted astigmatism reduction No personalization option FreeForm Based on advanced binocular eye- lens system model Enhanced view whatever the gaze direction High degree of lateral unwanted astigmatism reduction Personalized lenses
Conventional vs. FreeForm Smaller Optical visual zones More lateral astigmatism Higher astigmatism maxims Bigger optimal visual zones Less astigmatism Lower astigmatism maxims
Advanced Ophthalmic digital power structure Each lens is individually calculated using advanced algorithms to guaranty an optimized power structure Symmetrical structure of the far power distribution Symmetrical structure of the near power distribution Inset adjusted to each wearer Binocular adaptation guaranty
Automatic variable inset Inset (d) calculation method: Paramteters to be considered for inset calculation: sNear working distance l’ 2 Distance from lens to eye center NPDNaso-pupilar distance PPrescription
Conventional vs. FreeForm Inset Calculation Inset not taken into account in conventional lenses Correct inset calculation in FreeForm
Optimized reduction of lateral unwanted astigmatism Due to the advanced eye lens system optimization the lens minimizes the lateral unwanted astigmatim.
Optimized reduction of lateral unwanted astigmatism in FreeForm Lateral unwanted astigmatism have been reduced also for the human eye
Enhanced vision whatever the gaze direction Conventional lens SVFreeForm individual SV
High vision performance in FreeForm With FreeForm Conventional Wider and clearer far also for oblique gaze directions Wider and clearer near
Conventional PAL FreeForm PAL 1. Wider and clearer far 2. Wider and clearer near 3. Optimized intermediate 4. Minimized lateral astigmatism High vision performance in FreeForm
Personalization Personalization according to morphological parameters: Panto Wrap (ZTILT) Back Vertex Distance (BVD) Near Working Distance Pupillary Distances Frame Trace
Personalization Average personalization: FreeForm uses average values for optimizing the final lens to make easily the lens ordering Real data personalization: Additionally to average data, FreeForm optimizes the lens using the real values of each wearer for: –IPD – Inter-pupil distance –SEGHT –HBOX –VBOX ParameterLabelAverage value P.D.IPD 32 mm VertexBVD14 mm PantoscopicPANTO12º WrapZTILT5 º
FreeForm Individual Power Optimized for the wearer SPH: 3.25 CYL:1.50 AX:75 ADD:2.00 Brand Traditional progressive User power SPH: 3.25 CYL:1.50 AX:75 ADD:2.00 FreeForm İndividual progressive Base: 6.25 Index: 1.67 Lens meter power Distance SPH: 3.19 CYL:1.43 AX:62 Near : SPH:5.10 CYL: 1.67 AX: 58 Prescribed power = Measured power. The final user will perceive differences due to the use position. The final user will perceive the prescribed power. Expected power in the lens meter.