I guess the main confusion of defining this lens is probably the setting of depth/frequency. 8^EWD3N`
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The main fresnel lens types are: gZ&4b'XS,
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* Constant groove depth. Qe F:s|[
* Contant groove pitch types. 'bRf>=
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So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. MMk9rBf
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Hope this helps!!
