Hey PV. No need to feel stupid at all. Sorry to hear about your eyes, man. No offence intended. Glad to hear you got it sorted out. Same thing happened to me a while back. Kept getting kind of blurry after more than an hour at a screen, tunred out I needed glasses just for computer work.
These things will be available indefinitely (unless the company goes under). There will be a link to a web page from which you can order individually direct from the maker soon (I'll post the link as soon as he sends it to me). Prices might be a bit higher, but he'll keep them as low as he can.
Si