Hi all,
How different are the iso-astigmatism plots between degressive and progressives?
And given that the reference power in degressives is the combined near add - is there more control over the lens during casting and cutting - so that having a shallower or deeper frame is irrelevant?
I guess, my question in another form is: all else equal, if there are two frames (one deeper, one shallower) - would there be power difference at datum (usually the point of intermediate distance) and bottom (reading distance) on both frames?
I currently have a px who is struggling with a deeper frame on the same Rx (different design) than her older, shallower ones.
Any ideas?
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