I should clarify that this statement holds true for lenses of moderate to high power, or in frames requiring a great deal of decentration or a relatively large minimum blank size. As the powers drop below +/-3.00 D, or the decentration becomes negligible, the advantage in thickness can actually reverse in favor of plus lenses.Still for a shaped lens you could probably argue that the plus lens would be heavier, though the actual magnitude of the difference would depend upon several factors.
Best regards,
Darryl
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