Eyesight problems - anyone else had this?

For some time (years) I’ve had eyesight problems. I have an eye test, get new glasses, but my sight isn’t as sharp as I’d like it to be. For at least the past year my sight has been so bad that I can’t read a number plate at 20m, so I can’t drive. I recently found that raising my glasses slightly gives a marginal improvement, but I’m not sure it’s enough. There’s nothing the optician can do with the lenses. When I’ve seen an opthalmologist my sight with these glasses seems to be 20/20, but that’s probably because the chart is only about 6 feet away. My eyes are healthy-ish (early stage cataracts, but not enough to cause this problem), and I know I don’t have macular oedema, so it may not be caused by the Gilenya I’ve been taking for the past 12 years.

(The only way to confirm it’s not Gilenya causing the problem is to come off the drug and see if things improve. It would take about two months for the drug to clear my system. If it is Gilenya, I would then have to find another DMT. Interferon and Copaxone aren’t an option - I discovered that Betaferon had been causing depression, and I’m not doing injections again!)

My eyesight isn’t blurry. For reading and close work it’s pretty sharp. It’s distance that’s the issue. Has anyone else had this problem?