Another approach ?
I don't have failing eyes, but I get a sore back etc from peering down an eyepiece. So I've gone video astronomy, or as some say "electronically assisted astronomy". Instant (well within a few secs to a minute or so depending on what you are looking at) colour images, all on a small portable monitor. Or if you want a little bit of on-th-efly processing on a laptop. All from the comfort of inside - or pass the monitor around the scope.
I'll never touch an eyepiece again ! See
http://ballaratman.wix.com/videoastronomy
Cheers, Chris