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I have pretty severe astigmatism and myopia. Some years ago during a visit to my optician I mentioned the problem this gave me when using an eyepiece and she suggested making up a lens to specifically correct for my astigmatism saying that it could be mounted in an old 1 1/4 inch filter housing. As you probably know, the myopia can simply be corrected by using the telescope focusing system. This works well. After screwing the "filter" onto the eyepiece barrel it is simply a matter of rotating the eyepiece in the focuser until the direction of the astigmatism correction matches the direction of the astigmatism defect of the observing eye. Observing when using eyeglasses works too but usually the eye is then too far away from the eyepiece to be able to get the whole fov at once. Using the astigmatism correcting filter overcomes this problem. I don't know if this system works for all eyepieces but it does for the few that I use. Of course it's a bit of a bother having to remove the "filter" when sharing the view with someone else.
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