Reading glassesSee all questions about commodity
This really is an excellent question and something I’d never thought about- so thanks for asking it! Having just inspected my glasses, all I can read (even with poor eyesight!) is the measurements and the maker ‘Cheap Monday’.
My first thoughts were around space- perhaps there’s limited space in which they can engrave or print the ‘made in’, but I’m not sure that this is good enough reason. There is very limited transparency, or explanation about why made in info is missing- even my glasses case says ‘made in china’. I’ve enquired on your behalf, and will get back in touch when response is received. But, I’ve done some research and the manufacture of glasses in the meantime.
Glasses sure do have a pretty interesting ‘made in’ history- it’s something I never envisaged getting so excited about on a Friday morning! Eye glasses have been around for almost 8 centuries, improving people vision since they were first invented (albeit to varying degrees!!). Today they’re a ‘hot fashion accessory’ that the wearer can change to match moods or to convey an image. But, historically, ‘hotness’ was perhaps less on the agenda- the earliest glasses were unframed and held in front of ones face. These then progressed to being tied around your head with a ribbon, or attached to suits of armour- I’m sure being able to see when going to battle is probably a good thing (perhaps!?).
Traditionally, glasses were very expensive, until the American glasses making industry boomed. Italy too remains a big competitor in the eyewear industry. There is every chance your glasses could have been made in either of these places. In fact- the same Italian company- Luxottice makes almost every designer eyewear- from Prada to Chanel to Ray-Ban.
There are all different kinds of components making up your glasses, all from different homes. The main frame was once made from tortoiseshell and horn, but lots were actually made from celluloid- an early plastic that can be dyed or moulded to resemble the animal horn/shell. Today, tortoises are saved though, as most glasses frames are made from cellulose acetate. Cellulose acetate can also be found in cigarette filters and playing cards- though neither may improve your eye sight as much. Traditionally, this material is from cotton/tree pulp cellulose, but today it’s often mixed or replaced with nylon and polyester. Making them into the final product is a complex, technical process- the video here shows it nicely- https://www.selectspecs.com/info/how-prescription-glasses-are-made/.
I’m sorry I can’t answer your question specifically at this time- it’s a shame glasses manufacturers aren’t as transparent as the products they sell!