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Lens styles for digital surfacing are set up exactly as they would be for any new lens style. For example, to set up a new digital surfacing style "CUST14", using the calculation engine specified previously as digital surfacing interface "01", a lens style similar to the following would be set up:
General Tab
Minimum SegHt and Min SegHt Action- specifies the lowest seg height that can be used for this lens design. Setting this, and setting the Action to “E”, prevents the user from requesting a seg height that is invalid for the digital design.
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Digital Type – this identifies which digital surfacing interface to use for this lens style, if set, it activates the fields on the Digital tab. This number corresponds to the digital type number discussed in section 1.0.
Digital Tab
Some fields to note for this type of lens, on the Digital tab::
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Use Anti-Fatigue prism – this is enabled only for SignetArmorlite digital designs; if enabled, it sends _ANTIFATIGUE=1 to the SignetArmorlite calculator for jobs using this lens design.
Blend Edges (_LTLVL or CCBLND) - this is enabled only for CrossBows designs; if checked, it sets _LTLVL=1 in the LDS file to the digital calculatorcalculators, and allows access to the “Blend Diam / Bowl Size” field on the F12 Surface Options screen in order entry. For Essilor, Crossbows and A2Vision digital styles, the blend diameter is sent as a value from 0 through 2. For all other digital vendors, the value sent will be from 0 through 10.
Use Alt DEO paths – this is enabled only for Essilor, and is used for Varilux S processing. Designs with this option checked will use the “alternate paths” set up on the Essilor Digital Calculator screen, instead of the normal path for the surfacing and engraving files. If there is no alternate path set on the Essilor Digital Type, then the files will be created in the normal folders. This is generally used for Varilux S designs, to place the surfacing files into a separate folder for use by the CLBS blocking devices; these devices will then create the actual files to be used in manufacturing, in the normal folders.
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Min Thick at Crib Diam – this corresponds to the MINTHKCD field defined in the VCA specification – edge thickness on a plus lens is normally optimized to give the thinnest possible edge, and thus the thinnest possible center, for the best cosmetic result. Unfortunately, in the case of cut-to-polish equipment, a moderately strong plus lens in a small frame can result in an edge thickness at the crib diameter which is very thin. On the generator, this can result in cutter crash (where the blade will cut into the alloy), and on the polisher, this can result in the sharp edge of the cribbed lens cutting into the soft polish block. A lab can get around this problem by specifying a minimum thickness at the cribbing diameter – thus, if the lens is so thin/small that it might cut into the polish tool, this parameter would increase the thickness by requiring the edge at the crib diameter to be 0.5mm (for example). Please note that this will (obviously) increase the overall thickness of the finished lens as well (the finished ET could be greater than is cosmetically optimal).
Optional Fields Tab
Style-specific VCA labels and values can be set up on the “Optional” tab for the lens style. For example, to always force CORRLEN=14 for a particular style, add the CORRLEN label, with a value of 14, to the label grid as shown above.
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LDCRYPT and LDTYPE will be sent to equipment which requests it, indicating the surface data is in Indo encrypted format. The _OPTIM=1 label instructs Indo to optimize thickness for the design.
Fitting Instrument information (VMAP) when checked, will allow access to the VMAP field in the order 'F12 Surface Options" screen. This field can be used by some digital calculators to get more information regarding the patient's fitting of lenses. It references a file that contains information provided by the fitting device used by the optometrist when accessing a patient's needs.