US has token eye exams at the BMV. I've never seen or heard anyone fail.
During such a test that I could barely read anything, and afterwards realized I could not read most roadsigns--having relied too much on map apps. A visit to the eye doctor confirmed I shouldn't be driving, so I ordered glasses that same day.
Reporting unsafe drivers in my state is not anonymous. And at one point I had to tell a family member that if I found out they were still driving that I'd report them. (They had 3 accidents in 2 years, claiming it's all the computers in the cars.)
Some more context on the South African system, although before it was done at our equivalent to the DMV it now gets done by an optometrist.
When i first got my driver's license in the US I almost failed my eye exam. They gave me 3 chances and I just barely passed on the third. This led to me finally getting glasses.