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...you also need to get prescription glasses or even better, contacts. I used my $1 store readers for quite a few years until my pins started getting fuzzy. The glasses changed everything. Good luck!
I've had this same problem for the last 2-3 years. Readers improve the sight pin blurriness but the target becomes a huge blur and prescription glasses keep the target in focus while blurring the pins much worse than no glasses at all. I've learned which part of the blurred pin is actually the pin (the bottom 1/3rd of the blur) so that's how I've (sort of) resolved this situation so far. Certain lighting situations make the blurriness situation better or worse.I'll be honest, if I knew for sure that this "clarifier" would resolve the problem I would install it on my bow regardless of the legality.
If you can try a different color pin that might help. I think the green pin on the HHA site is very bright but if you change it to a red one you might see a clear edge on the pin profile. Also I have painted the inside of my scope ring flat black to stop the glare.