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I am about to get my first pair of spectacles. From where I am, glass lenses need a frame. Fiber-plastic lenses can be frameless. It's well known Fiber lenses are much more durable and longlasting. However, between the two, which is more sustainable ? I am hoping to take good care of glass lenses so as not to break. I know glass doesn't decay and the glass industry may have people in hazardous environments.

p.s. Assume, "not wearing spectacles" or "doing eye exercises" are not good enough options.

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    Probably not something to mention on sustainability site, ... but, when it comes to lenses for spectacles, glass lenses are heavier than plastic lenses and depending on the type of lenses you need, they may be very heavy & uncomfortable. Just something else to think about. – Fred Nov 2 '17 at 7:59
  • Right, I was advised about it. I don't mind choosing glass, for environ sake, if it's more sustainable, even if it's heavier. – Whirl Mind Nov 2 '17 at 12:11
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    I"t's well known that Fiber lenses are more durable"? Really? Every plastic lens I've owned (wearing glasses for 62 years now) is unusable inside a year from scratches. Yeah, plastic doesn't shatter when you drop it. But I've never broken a glass lens. Modern tempering is pretty good. – Sherwood Botsford Nov 7 '17 at 16:43

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