Depends on the lab. I would hope and assume labs are only using top end designs with Camber blanks.
Cherry has IOT's Camber Steady in the same (top) price tier as Varilux S/X, so no difference there. US Optical's CamberHD is cheaper than alot of their Varilux lines, I'll give you that (gives me slight pause on the quality of the design to be honest). Several others are significantly higher.
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