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I am minus 5 diopters, my visual acuity is worse than 6/60 (can't read the top letter on the chart), and I have no problem. The only potential problem is if you have a significant degree of astigmatism, in which case you might want to wear your glasses. That mainly means you'll need eyepieces with long eye relief.
If you're sharing the scope with someone, you might get sick of having to adjust focus each time, and you'll probably find it a bit of a pain having to slip your glasses on and off to read charts, etc, but apart from that you'll have no problem.
Cheers,
Brian.
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