Keith
The best camera is one that still works!
i'm a diabetic...one day the eyes are fine, next day i have problems focusing...apparently it has something to do with pressure behind the eyes...some diabetics can have several pairs of glasses and see which works best for a particulay day.
Ahh ... so it's a focus problem and not a light problem!
I understand totally because I wear contact lenses that are affected by relative humidity ... on a bad day (extremely dry) my vision can be all over the place so I can imagine your problems. I'd forgotten you were diabetic and I'm familiar (not personally) with the vision issues this condition brings to the table.
Maybe you need an Xpro? 😀