4• 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 type4
5General information about the technology • Free form is a manufacturing technology that allows cutting and polishing arbitrary surfaces• A lens is free-form ifAt least one of its surfaces is made with free form technology andThat 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.
7How 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.
8What 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
14Wider 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.
15Comparision between FreeForm and Conventional PAL Based on the geometry of the lens to calculate the power resultedEnhanced view mainly in the central gaze directionSmall degree of lateral unwanted astigmatism reductionNo personalization optionFreeFormBased on advanced binocular eye-lens system modelEnhanced view whatever the gaze directionHigh degree of lateral unwanted astigmatism reductionPersonalized lenses
17Advanced Ophthalmic digital power structure Each lens is individually calculated using advanced algorithms to guaranty an optimized power structureSymmetrical structure of the far power distributionSymmetrical structure of the near power distributionInset adjusted to each wearerBinocular adaptation guarantyThe symmetrical structure is very important for binocular vision, notice that each lens is horizontally opposite to the other, so when the right eye is using the nasal part of the lens, the left eye is using the temporal. If the far distance is not symmetrical the eye could find points where the quality of binocular vision is good only for one eye, so the comfort would be not good.
18Automatic variable inset Inset (d) calculation method:Paramteters to be considered for inset calculation:sNear working distancel’2Distance from lens to eye centerNPDNaso-pupilar distancePPrescription
19Conventional vs. FreeForm Inset Calculation Inset not taken into account in conventional lensesCorrect inset calculation in FreeForm19
20Optimized reduction of lateral unwanted astigmatism • Due to the advanced eye lens system optimization the lens minimizes the lateral unwanted astigmatim.
21Optimized reduction of lateral unwanted astigmatism in FreeForm Lateral unwanted astigmatism have been reduced also for the human eyeThe lateral unwanted astigmatism has been minimized
22Enhanced vision whatever the gaze direction Conventional lens SVFreeForm individual SV
23High vision performance in FreeForm With FreeFormWider and clearer far also for oblique gaze directionsWider and clearer nearConventional
24High vision performance in FreeForm Conventional PALFreeForm PAL1. Wider and clearer far2. Wider and clearer near3. Optimized intermediate4. Minimized lateral astigmatism
25Personalization Personalization according to morphological parameters: • Panto• Wrap (ZTILT)• Back Vertex Distance (BVD)• Near Working Distance• Pupillary Distances• Frame Trace25
26Personalization Average personalization: Real data personalization: • FreeForm uses average values for optimizing the final lens to make easily the lens orderingReal data personalization:• Additionally to average data, FreeForm optimizes the lens using the real values of each wearer for:IPD – Inter-pupil distanceSEGHTHBOXVBOXParameterLabelAverage valueP.D.IPD32 mmVertexBVD14 mmPantoscopicPANTO12ºWrapZTILT5 º
27FreeForm Individual Power Optimized for the wearer BrandTraditional progressiveFreeFormİndividual progressiveUser powerSPH: 3.25CYL:1.50AX:75ADD:2.00Lens meter powerDistanceSPH: 3.19CYL:1.43AX:62Near:SPH:5.10CYL: 1.67AX: 58SPH: 3.25CYL:1.50AX:75ADD:2.00Base: Index: 1.67Base: Index: 1.67Prescribed power = Measured power.The final user will perceive differences due to the use position.Expected power in the lens meter.The final user will perceive the prescribed power.