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Ahmed near (or long) sightedness is not a problem - focussing takes care of that.
Regarding your astigmatism, when looking at stars through the scope at low power, if you see nice dots its not a problem. If you're seeing stars stretching as lines or crosses you could use a dioptrix, they do work.
Its more of an issue at low power. At high magnification the exit pupil will be 1mm or less in which case its unlikely to matter.
Or do as I do - wear the specs most of the time regardless, and make sure you buy eyepieces with enough eye relief.
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