Tracy, I would advise getting an eye test to to determine your actual sight requirement. Non-prescription glasses are a cheap option, but don't take account of the difference between right & left eye.
When I worked for a living, I used 'pound-shop' glasses for a few years, but eventually got my eyes tested & some prescription glasses. The cost wasn't huge & I could see the benefit immediately.
I had a quick look to see where I got my DK20C from & noticed they have a +2 version:-
Nikon 2.0 Dptr. E/Piece Correction Lens F65/80 Viewfinder for sale online | eBay
I think it took a couple of weeks to arrive.
Enough waffle from me.
Thank you for waffling. I appreciate it.
I do wear prescription glasses, with different strengths in each eye. (I've worn glasses for 45 years) My left eye is much worse than my right. I can read great with +3 store bought glasses and with my prescription glasses, so seeing as I can read great with wither, I figured a +3 diopter for the Nikon.
It seems like the dK-20C +3 is like hens teeth at the moment. Every place I checked are 'awaiting stock'. I checked some US sites and they have them, but with $25 shipping.
Like I mentioned I did purchase one from a reputable seller here in the UK, but they sent an email saying the item was not in stock, but were trying to locate one.. I'll see what they come up with by wednesday. Failing that I'll get one from Japan vie eBay.
Do you think the +3 will be ok,
Thanks
Tracy