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May I make one small addition to Merlin66's explanation above? If you normally wear spectacles because you are long or short sighted then you can do without your spectacles at the scope if you wish. Your best focus point will be different to that of somebody who is not long or short sighted but the image you see will be just as good. However, those of us who wear spectacles to correct astigmatism cannot focus away that aberration (although it becomes less bad with decreasing exit pupil size).
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