You are in Canada and I am in the US, so the legal and insurance requirements may differ. Given that, I will share with you what I did.
I discussed with my nerologist that I wanted to drive as long as I safely could, but recognized I might not be the best judge of when to give up driving.
He (strongly) suggested that I be tested by a specialist organization to ensure I was still safe to drive.
This wound up being a 4.5 hour battery of tests. I was tested for vision, cognitive ability, coordination, and strength. This was followed by a driving test.
Fortunately, I passed. The test was very tiring and cost over $600 (not paid for by insurance). But, the result of the test provided quantitative evidence that I am still safe to drive.
I plan to retake this test periodically to ensure that I am safe to drive. In the US, and Colorado specifically, passing this specific test means that I do not need to declare any disability to the Division of Motor Vehicles, even though I showed up for my license renewal in my wheelchair!
Steve