On Sat, 29 Dec 2018 09:50:55 +0100, Paul Schlyter
wrote:

I don't have one single eye doctor. For my visual acuity test it's
been different opthalmogists almost every time, and they all gave my
visual acuity as a decimal number.

Well, thanks for the heads-up. If I ever have an eye problem in
Sweden, I'll cross the border into Denmark to get it addressed, since
I know that Danish ophthalmologists follow international standards.