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OP,
As a long time wearer of specs (50+ years) and stargazer: For eyepieces,
1.its all about long eye relief. 20mm is what you need; anything less, forget it.
2. take a close look at the what's facing your specs (and your eye). Any metal rings - or edges (even worse) will rub the specs, and may leave a permanent scratch, even with hard coatings.
Best are types that have a rubber ring or eyecup of some sort that can be folded down (leaving room for the specs) but preventing the specs touching anything metallic.
3. Get a neckstrap for your specs so you don't lose them in the dark.
Even a safety pin stuck in your collar and some thread will do at a pinch.
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