Neil, What can one say Mate? There is nothing I can say that will make you feel better or change your sad predicament at this present time! Im SO sorry, I have had elder members in my Family with 'Optical Difficulties', so I can empathise with you.
The ONLY thing I know that is a crumb of comfort is. That you DO have friends here on the Forum & also at Shows. At shows, I am convinced there will be any help & assistance that you MAY need at forth comming shows! Keep your chin up Mate, it's easy to say. BUT, dwelling on the problem is not going to help, think as positive as you can. Easy to say I know. But it DOES help. A Good outlook & attitude is infectious & People warm to others like that! Keep us all upto speed Bud!
Cheers, Regards: Mike