Not sure where to have posted this...
Any progressive wearers have advice about using them at the eyepiece? I prefer no glasses but am starting to struggle with charts, lists, and SkySafari without them.
I'd like to use glasses to look at my charts, and then through the finder to locate the object area. Then I'll drop them down and observe without.
Was thinking of getting a single power pair made but am curious to know if it should just correct my vision or go with some extra power like the lower third of my progressives.
Or maybe just go buy a pair of readers?
Progressives don't work at the scope.
Most of the field will be out of focus.
If you need astigmatism correction and readers, try bifocals.
If you don't have astigmatism, simple readers hung around the neck on a lanyard can be used when looking at charts and stuff and glasses won't be necessary at the eyepiece.
If you go for bifocals (my solution), get a lab willing to make the reader section on the bottom very small so the reader section is NOT in your field of view when using the scope.
I got mine at Costco and they made the reader section only 8mm tall and since I went for larger lenses, the reader section is not visible when looking through the eyepiece.
How can you tell if you need a distance prescription at the scope?
1) look at the stars naked eye, then look at the stars with glasses on. Did the stars improve? You need glasses at the scope--at least with low power eyepieces.
2) look at the stars in a low power eyepiece in the scope without glasses. Look at the stars in the center of the field. Repeat, using glasses. Did the star images improve? You need glasses at the scope.
[Aside: If the stars aren't tiny little round points with glasses on, you need a different prescription. Time for new glasses.]
Can you remove glasses and view without them at some point when the focal lengths of your eyepieces get shorter?
--repeat the low power eyepiece routine with every focal length. At some point, you won't be able to see a difference with or without glasses.
With that focal length and shorter, you can remove your glasses to observe. That happens for me at 9mm, but will happen at different points for every observer.