We just went through this with some older folks on our lease. One saw a world of difference with the old Zeiss conquests..
The other just had issues this year and looking through a 40 year old 36 mm L, and a conquest and a Divari and a whatever my newest Zeiss something 5, he could tell NO difference to his eyes.
All I can say is the best you might do is hope to find others with similar better scopes and see if you could borrow them to look in the woods at dark etc.....might be the only way to know and there may be no difference to your eyes at this point.
