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I didn't want to pony up for trifocals now that I am retired, but I also don't want to lose my glasses. I decided it was time to do the old lady thing and get the chain. Several other glasses chains feature a clip for each side, which would be both uncomfortable and unattractive, in addition to probably wearing out sooner or later and snapping off. I went with this chain because of the slip-knot type of fastener, and because my face looks better with gold than with silver.
So it's all right, but one side constantly comes loose. I adjust it tighter; it comes loose again anyway.
If both sides were to do this, my glasses would likely fall off and break and I would be really bitter about having bought this product. However, one good firm gripper is enough to keep them from hitting the floor, and so when I see one side is loose--which occurs probably every other day--I secure it again. I suppose I could just superglue it on, but I don't always want the chain, so I'd be reluctant to do that.
In the end, I will continue to use this chain, for now, at least, but I am not sure I recommend it to you.