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Max OC decentration - This field is only used when the blocking method is set to “D” (for Semi-Tech dual center blockers) and specifies the maximum difference between the geometric center and the optical center.
Prism Settings:
Lab has a prism blocker - This field should be checked if the lab uses a Prism Blocker.
Combine Rx and decentration prisms - When checked, the Rx and decentration prisms will be combined for jobs blocked on optical center and then switched to Geometric center blocking. This especially affects decentered progressives, which many labs block on OC. Therefore, when checked, a decentered progressive with Rx prism will be switched to GC blocking and have prism ground for both Rx and to decenter the OC back to appropriate spot.
Use Pratt formula for prism - Checking the option uses an alternate method of calculating prism, which is more accurate on low-power lenses. See QRG on the Pratt Prism Formula for compete details.
Prism thinning on minus - When checked, will apply prim thinning on low power minus lenses if the power, including add, is plus along any meridian.
When not checked, will not apply prism thinning if the power of the lens is minus along any meridian.
Prism thinning base up - When checked, will calculate base up or base down prism as required to equalize thickness.
SV Prism Grinding - This setting controls prism on single vision lenses. The settings are:
Always grind maximum - Always grind maximum prism on SV lenses.
Grind to move OC - Only grind prism on SV lenses when required for cutout; when prism is required grind all prism to move OC to desired point.
Grind to move OC by decentration - Only grind prism on SV lenses when required for cutout; grind minimum amount of prism to move OC by decentration as well.
Grind Rx Prism - Grind minimum amount of prism when required for cutout, but grind all of the Rx prism. (Do no decenter lens for Rx prism purposes)
Executive Prism Grinding - This setting control prism on executive lenses. The settings are:
Calculate for decentration - Calculates prism for decentration.
Do not calculate - No prism calculated for decentration
Calculate with BOC of zero - Used in conjunction with a BOC of zero for an executive lens to prescribe prism vertically in order to draw the OC down to the segment line (mainly used in European labs)
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Lab has Coburn style generator - Check this setting if the lab uses a Coburn style generator.
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Default vertex fit distance - This is the default vertex fitting distance that will be used when doing wrap calculations if no specific value is entered for the order.
Default vertex refracted dist distance - This is the default vertex refracted distance that will be used when doing wrap calculations if no specific value is entered for the order.
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Prism Settings:
Lab has a prism blocker - This field should be checked if the lab uses a Prism Blocker.
Combine Rx and decentration prisms - When checked, the Rx and decentration prisms will be combined for jobs blocked on optical center and then switched to Geometric center blocking. This especially affects decentered progressives, which many labs block on OC. Therefore, when checked, a decentered progressive with Rx prism will be switched to GC blocking and have prism ground for both Rx and to decenter the OC back to appropriate spot.
Use Pratt formula for prism - Checking the option uses an alternate method of calculating prism, which is more accurate on low-power lenses. See QRG on the Pratt Prism Formula for compete details.
Prism thinning on minus - When checked, will apply prim thinning on low power minus lenses if the power, including add, is plus along any meridian.
When not checked, will not apply prism thinning if the power of the lens is minus along any meridian.
Prism thinning base up - When checked, will calculate base up or base down prism as required to equalize thickness.
SV Prism Grinding - This setting controls prism on single vision lenses. The settings are:
Always grind maximum - Always grind maximum prism on SV lenses.
Grind to move OC - Only grind prism on SV lenses when required for cutout; when prism is required grind all prism to move OC to desired point.
Grind to move OC by decentration - Only grind prism on SV lenses when required for cutout; grind minimum amount of prism to move OC by decentration as well.
Grind Rx Prism - Grind minimum amount of prism when required for cutout, but grind all of the Rx prism. (Do no decenter lens for Rx prism purposes)
Executive Prism Grinding - This setting control prism on executive lenses. The settings are:
Calculate for decentration - Calculates prism for decentration.
Do not calculate - No prism calculated for decentration
Calculate with BOC of zero - Used in conjunction with a BOC of zero for an executive lens to prescribe prism vertically in order to draw the OC down to the segment line (mainly used in European labs)
Missing Entries
Use Plano ET for minus lens
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