AW: Does anyone know how to fit a diopter correcting lens on a Leica M2?
Your dealer should have them in stock actally.
If not, he can certainly order them for you to try. The prescription is not exact enough because a built in diopter factor of the vf has to be taken into account. So just try several and choose.
Had to change mine over the years, eyesights are prone to get worse ...
The correction lenses do have a little rubber rim to protect glasses. At least good enough for normal sunglasses, because with the correction lens attached you can leave your glasses in your pocket ...
Best
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