Things like an eyesight test wouldn't have to be done at a particular place, an optician could do one in a few minutes.

Studies need to be done as to just what possible defects could be a problem to an older driver and are most likely not to be realised or recognised by those drivers, the mere repeating of the driving test may not reveal them.

I could easily pass the eye sight requirement of the test without wearing my glasses but I wouldn't consider I would be safe to drive without them, it takes the edge off as it needs greater concentration.