Sorry, Spec, but that's not at all true - plastic lens make a HUGE difference - the weight difference is considerable, and the introduction of plastic lens made a great improvement in comfort for spectacle wearers.
Glass lens have obvious advantages, but aren't much use if they are too uncomfortable to wear
Yes, you are right Nigel. Plastic has made a big difference to comfort- afraid I am a bit biased; I still prefer glass. Perhaps I should have said the weight of glass is not a problem for me.
spec
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