I had my annual eye exam the other day and when he was checking what lines I could see, most where in the 20/20 range with my current prescription. When he was doing that better or worse flipping, occasionally I could read part of the line under the 20 mark that said 15. Question, is it any better to have glasses that can read 20/15 for observing the sky and stars ect? Would they be deeper and sharper. I do not use glasses when I'm observing through the scope?
Thanks and Happy New Year all!
The question is: Do you have astigmatism? When you focus the telescope, that takes care of any nearsightedness/farsightedness you might have. If you have a significant amount of astigmatism, then wearing glasses can help.
Astigmatism is generally an issue at large exit pupils, resolution is greatest at small exit pupils.
Do you have your prescription? You should have spherical and cylinder (in some abbreviation) for both eyes. The cylinder is the astigmatism. This is the TeleVue page on the Dioptrix. It fits some eyepieces and corrects for astigmatism. It has some good information about exit pupil versus astigmatism.