Originally Posted by Andy_T
Still had my parents' warning from 35 years ago in my head "You are going to ruin your eyes by reading under a blanket with a flashlight"...
Thankfully, there is no truth to that statement. Astronomers spend a great deal of time straining to see the faintest detail at the eyepiece, and then using dim flashlights to consult charts and books, and their eyesight is no better or worse than anyone else.
On the other hand, reading is going to ruin your eyes, which is why so many of us suffer from myopia. The human eye was not designed with reading in mind.
Thanks to all for this discussion and vote. It's been most helpful to a potential (and now likely) buyer.