Although I normally wear Varifocals, I have a pair of single-vision distance glasses (from a cheap online supplier) for astro use. In practice, they get used for coarse aiming through the Telrad; then I take them off for fine aiming and viewing. I have TV Dioptrix, which work well but are fiddly to set up and get exactly right.
Because my left eye is weaker than my right, I made up a 1.25" "washer" out of 2mm thick printed circuit board to raise the left eyepiece farther out of the binoviewer than the right eyepiece. Then each eye can be adjusted within the range of the binoviewer (a Maxbright II, which has less adjustment range than the William Optics BV it replaces).