19.01.2005 f+e bg / nadine jung / martin zimmermann1 contents of "technical product...

19.01.2005 F+E BG / Nadine Jung / Martin Zimmermann

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Contents of "Technical Product Information“

1. Product details2. Product comparison3. General notes on ordering4. Lens calculation/Optimisation5. Special features of production6. Complaints7. "Expandable" delivery range8. The official line

Sport lenses "Technical Product Information“


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Sport lenses Overview of products and versions:

“Perfalit Sport”“ImpressionILT Sport”

extra curved

For large FFAsand tilts Takes account of the geometry of the frame(FFA up to 25°)

Especially calculated to avoid prismatic side effects with highly curved and tilted lenses

A special progressive design for dynamic vision with highly curved and tilted Sport lenses

Power range -4 D to +4 D cyl 2Curved base curve (approx. 7.5D)

clip-in

Base curve around 1D more curved than basic curved to avoid eyelash contact. Takes account of the geometry of the frame.(FFA up to 20°)

Design: like “Perfalit Sport extra curved”

A special progressive design for dynamic vision

Power range -6 D to +6 D cyl 2Base curve approx. BC +1 D over normal version

basic curved

For sports eyewear and sunglasses with "normal" geometry. Takes account of the geometry of the frame.(FFA up to 15°)

Design: like normal Perfalit SV

A special progressive design for dynamic vision

Power range -8 D to +8 D; cyl 4 DBase curve as with the normal versionFace form angle and power ranges are matched to one another for reasons of compatibility!


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1. Product detailsThe face form angle• The plane of the frame does not coincide with the plane of the

eyeshape • The resulting angle between the two planes is known as the face

form angle (FFA)

Plane of the frame

Plane of the eyeshape


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1. Product detailsThe tilt angle• The tilt is approximately the same as the face form angle when the point of vision coincides with the geometrical centre of the eyeshape• In dependence on the face form angle, the curvature of the lenses and the frame and fitting data

Point of visionGeometrical centre of the eyeshape

Tilt angle

Plane of the frame

Tangent at vision pointon front surface


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1. Product details

The following problems arise due to the tilt angle with sports eyewear:

• Prismatic side effects• Oblique astigmatism• Refraction errors

Rodenstock Sport lenses take the special conditions during sports into account so that optimum vision is taken into account during sports


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1. Product details – Perfalit Sport

• Three-point stamp• The centre marks the

reference point and fitting point

• R/L marks• Rodenstock brand

engraving (position free as with normal SV)

• Ordering toric lenses: The axis must be given

• Lenses may not be rotated by 180°


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1. Product details – Perfalit Sport

• The front surface of the Perfalit Sport lenses is spherical with the following base curves– Extra curved: BC 7.26 (no slipping up or down possible at present)– Clip-in: BC 4.17 to 8.75 (slipping up or down possible using Rx Lab

Dialogue and tableau)– Basic curved: BC 2.10 to 10.39 (slipping possible as above)

• Perfalit Sport takes account of the refraction values as well as the position of the lens in front of the eye (but no optimised atoric surface)– PD, pantoscopic tilt, FFA (CVD optional for conversion from the trial

specs) – Frame shape and fitting

• the imaging errors and prismatic side effects which occur due to the tilt of the lenses are corrected– optimum vision in the position of wear


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1. Product details – Perfalit SportDelivery range & Diameters

Prism: up to 5 D where technically feasibleOrdering a larger diameter with Perfalit 1.5 and PCM (up to j80):• Order is received via tableau with changed PD• Job reworking in the Rx Lab Dialogue with correct PD

extra curved ≤ j75

Clip-in ≤ j70

Basic curved ≤ j70

Cyl 4.00Cyl 2.00Cyl 2.00


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1. Product details ImpressionILT Sport

• Stamp and engraving as with ImpressionILT

• ImpressionILT Sport: Marked by an "S" nasally in front of the base curve engraving

• With clip-in: XS stamp, as with clip-in frames ImpressionILT Sport with shorter progressive zone length, similar to XS


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1. Product details – ImpressionILT Sport

• ImpressionILT Sport is optimised especially to the needs of sports-active presbyopic spectacle wearers– The near zone of ImpressionILT Sport has been designed for a

distance range for near vision of a maximum of 60 cm

– ImpressionILT has a larger distance zone than all-round progressive lenses

• ImpressionILT Sport takes account of the position of the lens in front of the eye in addition to the refraction values (online optimisation of the progressive atoric surface)– PD, CVD, pantoscopic tilt, FFA

– Frame shape and fitting


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Product details – ImpressionILT Sport

• ImpressionILT Sport, like Perfalit Sport, is available in 3 different lens versions– Extra curved BC: 7.5 (slipping down possible using Rx Lab

Dialogue and tableau)

– Clip in BC 3.50 to 9.5 (slipping up or down possible using Rx Lab Dialogue and tableau)

– Basic curved BC 2.0 to 10.5 (slipping possible as above)

• Special features for ImpressionILT Sport for Clip-in: XS version

• Blanks of the ILT products


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1. Product details – Perfalit SportDelivery range & Diameters

Addition: 1.00 D to 2.50 DPrism: up to 5 D where technically feasibleNote: ImpressionILT Sport: 2.5 mm pre-decentration (can also be

ordered as a centred lens, pre-decentration for extra-curved will later be increased

to 5mm)

extra curved ≤ j75

Clip-in ≤ j70

Basic curved ≤ j70

Cyl 4.00Cyl 2.00Cyl 2.00


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Monocular aberration (VA representation)

Conventional progressive, ordered while quoting the refraction values: sph +2.0 cyl +1.0 A 60 Add 2.0 and glazed into a normal prescription frame (non-tilted lens).


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Monocular aberration (VA representation)Conventional progressive, ordered while quoting only the refraction values: sph +2.0 cyl +1.0 A 60 Add 2.0. (A FFA of 4° and a base curve of 5.5 D were used as the basis when calculating the lens)

Glazing into a sports frame with an FFA of 12°. In addition, the lens was surfaced with a base curve of 7.0 D to ensure better fitting of the lens into the sports frame.


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Conventional progressive lens, ordered while quoting

the refraction values: sph +2.0 cyl +1.0 A 60 Add 2.0 and theFFA. (State of the art, e.g. Metzler Performer)

Improvement only in the main-vision point.Restrictions in the vision zone due to thechanged base curve and the highFFA (20°).



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ImpressionILT Sport, ordered while quoting the refraction values: sph +2.0 cyl +1.0 A 90 Add 2.0. In addition, the required FFA of 12° and a base curve of 7.0 D were given in the order.

The representation illustrates vision through the Impression ILT Sport progressive lens. The parameters of the wearing situation correspond to the parameters used as the basis for the calculation.



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1. Product detailsAdvantages of ImpressionILT Sport

• Best possible correction due to consistent optimisation for the position of wear

• Highest possible vision comfort with a design especially configured for the needs of athletes

• Visual zones important for sports are larger than with all-round progressive lenses

• Near zone of 60 cm adapted to sports activities

• Precise inset for near distance of 60 cm

• Reduced swimming effect over all-round progressive lenses

• Low distortion, unlike sport lenses which were not especially calculated and which have been glazed into a frame with a higher FFA

• The imaging errors and prismatic side effects which occur due to the tilt of the lenses are corrected


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ImpressionILT SportRefraction values: sph +2.0 cyl +1.0 A 60 Add 2.0FFA: 12°, BC 7.0D

Conventional progressive, ordered while quoting only the refraction values: sph +2.0 cyl +1.0 A 60 Add 2.0. FFA: 4°, BC 5.5D .

Glazed into a sports frame with an FFA of 12°, BC 7.0D

Binocular visual impression (VA representation)


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2. Product comparison • R+H Sports (SV)• Sola Spazio (SV)• Metzler Performer (SV) Face form angle is taken into account in the calculation

• Metzler Performer (progressive)a conventional standard progressive lens takes the tilted wearing position into account


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3. General notes on ordering

Perfalit Sport

• Prescription values (including axis position for toric lenses)• Lens type, colour and coatings• Interpupillary distance (PD in mm)• Face form angle (FFA in °)• Frame and fitting data (incl. box shape)• Trial frame ordering/Trial frame CVD


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ImpressionILT Sport

• Prescription values• Lens type, colour and coatings• Interpupillary distance (PD in mm)• Face form angle (FFA in °)• Pantoscopic tilt (PT in mm/°) • Corneal vertex distance (CVD in mm)• Trial frame ordering/Trial frame CVD • Frame and fitting data (incl. box shape)


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• Ordering Perfalit Sport: Axis must be given for toric lenses

• Ordering ImpressionILT Sport:– Refraction data for distance– Addition (40cm)

• Example:– The near zone is designed

for 60 cm– Lower position of wear

value & lower measured value (1.39 D)



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3. General notes on ordering Measuring the individual parameters:

• PD, pantoscopic tilt as usual• FFA as usual (if the FFA differs substantially in the fitted state:

Note as in Tips and Technology, Sport)• CVD measurement not from the front, but obliquely from the

side:Plane of the frame

CVD


CVD measuring ruler


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Ordering with frame and fitting data– Absolutely necessary!

– Eyeshapes transferred using the order form

– If there are any questions in this respect, refer to the Tips and Technology for Sport lenses

– e.g. Manual determination of the eyeshapes

– Determination of the eyeshapes during tracing


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3. General notes on ordering and on edgingThe corrected PD for edging (schematic representation) -> the COR PD is usually smaller than the customer PD

Plane of the frame


Customer PD L Customer PD R

Visual axis when looking straight ahead


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The COR PD results from the calculated decentration in the x direction. This is dependent on the following parameters:

• Frame data – Eyeshape length

– Distance between the lenses

– Face form angle• PD• Base curve

New pictogram on the lens envelope (COR PD)


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Determining the COR PD(in advance to determine the diameter)

• In the Rx Lab Dialogue under "Tools" Point "Sport Edging PD…“• On the BTablet under "Centration nasal“

The COR PD is only approximate; it is better to perform an Rx lab calculation to determine the diameter correctly!


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Check the lenses with reference to the lens envelope• Distance power: Nominal measured value for sphere, cylinder

and axis at distance measuring point (fitting point)• Prismatic power: Combined power from thinning prism,

prescribed prism and compensation prism• Addition: Difference of the average power between the near

measuring point and the distance measuring point

ImpressionILT


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An offset towards the eye results from the tilted position of the lens and the prismatic deflection.

When checking the centration with the spectacles being worn, the fitting points is not at the pupil centre since this is shown outwardly offset.

Check the glazed lenses in the sports frame


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4. Lens calculation• Tableau + BTablet: Job recording, not a job calculation!

– PD is converted from BTablet. If all parameters and frame data have been entered correctly, the COR PD values from Rx Lab calculation and tableau coincide!


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4. Lens calculation• Tableau: Order arrives as "Uncut and Shape" with opt.

diameter• Rx lab dialogue: If a shape is used, an MDM 3 job is

automatically calculated-> With Rx Lab Dialogue, make sure that the job is calculated as "Uncut and Shape" and opt. diameter.


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4. Lens calculation


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Entry in "Trial frame“

With Perfalit Sport• Set pantoscopic tilt to "Standard• CVD correction if trial frame CVD differs from prescription CVD


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4. Differences to previous lens calculation • Face form angle: Previously no difference in the tilt angle of

the lens and the FFA • No rounding: Required values are calculated and surfaced

precisely (e.g. prism 0.32 D) • Reference point: Optical centre and reference point do not

coincide; this was previously not taken into account. • Surfacing: The lens can be checked using the calculated

nominal values and be fitted more precisely using COR PD.


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5. Special features of production

Perfalit Sport and ImpressionILT Sport:The useful diameters can be restricted due to the high front surface curvature

The diameter depends on• eyeshape length of the sports frame (should be as small as

possible)• fitting (should be as central as possible)

– Sports frames usually have a large eyeshape length so that a large PD would be more advantageous

• A higher RI generates advantages (1.6)• MDM is not always the best solution due to the minimum edge

thicknesses


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6. Complaints (incompatibility)• Different angles for R/L arise between the lens and the

angle of view for lateral movements of gaze– The spontaneous visual impression can differ from that of

the previous spectacles

– The change can require a period of adaptation

19.01.2005 F+E BG / Nadine Jung / Martin Zimmermann 37


6. Complaints (incompatibility)• Different magnitudes of

aberration arise for R/L at the corresponding points of vision for lateral movements of gaze

– Astigmatism

– Effect

– Magnification

– Distortion

See on the right for an example of magnification


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• When analysing the incompatibility, differentiation between monocular and binocular

– Monocular: possibly glazing error

– Binocular: interpose a prism


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7. "Expandable" delivery range“ – Perfalit Sport and ImpressionILT Sport are only

produced in the delivery range shown!– The power ranges are selected for the different lens

versions so that the binocular aberration is still just acceptable with a maximum orderable FFA

– A higher addition than 2.5D is not possible, as an addition of 2.5D would also result with an ordered addition of 3.0D

– No guaranteed production of orders outside the delivery range (release by the product manager)

– With Perfalit Sport 1.5 and PCM Externally: Diameter 75 Internal diameter 80 -> Presentation in diameter 78 possible


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8. The official line• Point out the general problems with highly tilted lenses• „Physical laws" cannot be suspended so that power ranges

are limited• Aberration

– Prismatic side effects– Astigmatism– Refraction errors

• Binocular problems

– With lateral movements of gaze– Different visual impressions are unavoidable

The system-induced binocular imbalance can result in longer adaptation periods in very sensitive wearers


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Questions already raised

• Why cannot SV Sport be ordered in decentred form?Pre-decentration causes problems in positioning the measuring point in production. For this reason and for time reasons (market launch date), this expansion was not pursued further.

• Can the BC be changed with Extra Curved?Extra Curved only has one available BC (ILT: BC 7.5; SV: BC 7.93 or 7.5) -> Extension to follow

• Can the BC be changed with Clip-In?Yes; Clip-In has a more curved BC association than comparable SV lenses


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Questions already raised

• How can the diameter already be determined before the order?

– Enter actual customer PD under BTABLET in addition to "Centration nasal

– Press the "Centration nasal" button - the dialogue window for the calculation of the edging PD opens

– Please check whether all input parameters are correct here

– After the calculation, the edging PD is taken over automatically in BTABLET by pressing "OK

– The diameter is displayed in the window "Du Min"


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Order form

19.01.2005 f+e bg / nadine jung / martin zimmermann1 contents of "technical product...

Documents

perfalit sport lenses

product detailsthe tilt

curved base curve

normal svordering toric

normal geometry

face form angle ffaplane

aboveperfalit sport

resulting angle