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Note that some digital vendors will have their own rules for thicknesses, and they may over-ride the requested thickness from Rx-Universe.
IOT, Crossbows, and Essilor will respect MINEDG and MINCTR, and the resulting CTHICK is (usually) close to a requested center thickness. Zeiss appears to implement their own thickness constraints and the resulting CTHICK does not respect the requested MINCTR.
When specifying center thickness (especially on a plus lens) in Rx-Universe, and sending the job to the digital calculator, if the results are not as expected, the lab can verify what is being sent to the calculator in the LDS file.
Ensure that the MINEDG and MINCTR labels are both being sent, and that the MINEDG=0.01, and that MINCTR is sent as the requested CT. For example, if a CT of 1.8 was requested on a digital job:
The lab can check to ensure that the correct MINEDG and MINCTR were sent in the LDS file:
In this case, the CTHICK sent back by the calculator is exactly as requested (CTHICK=1.8).
If the correct MINCTR is sent, and MINEDG=0.01 is sent, but the resulting thickness is not what the lab requested, the lab should contact the specific digital vendor to discuss.
Electronic Interfaces
Rx-Universe can receive a specified center thickness as part of an order file sent in GIF format.
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