It's interesting to realise that Beethoven probably wore spectacles quite often but no contemporary portrait shows that fact.
Love the title of that one. Didn't Beethoven wear spectacles early on and then later on in life for some reason didn't need them all that often?
https://books.google.co.uk/books?id=...lasses&f=false
I don't know if Beethoven was wearing spectacles later on in life. I know my own long range vision has improved in my sixties - my optician tells me that's quite common.
A link on the Eyeglass Duo:
http://www.viola-in-music.com/eyeglasses-duo.html
Don't think I have heard this one myself yet..
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