I find that my unaided eyesight is fine for reading dashboard instruments or a computer screen. With distance glasses on, the dashboard is *slightly* less clear, but so little as to be negligible. With my reading glasses on, the dashboard is a lot more blurred (and the world outside is hopeless).
My accommodation is a lot worse than it used to be: my distance eyesight has always been good and still isn't bad, but I could also read without glasses until about 5 years ago, though I may have been struggling more and more before I realised. Now I can't read a book without glasses.
Dashboards are different from reading: text is larger in relation to apparent size at the viewing distance, compared with normal book text; most of the time you need to see the position of a needle relative to a marker and some numbers. As long as the vision is good enough to determine what the icon is on the light that's just come on, that's good enough. (Mind you, I have "icon blindness" in that I can see the icon fine but have great difficulty working out what is depicted so I can relate that to what it means - which is psychological rather than optical. It would help if all cars used identical icons for the same situation - not just the same picture but the same drawing of it - in the way that all cross-roads signs are identical copies of each other, not just a cross of variable design.) Road signs and play/pause/rewind icons are fine. It's all the esoteric ones for "windscreen washer low", and "headlights" versus "foglights" that have so many different forms.