Do they randomly stop drivers to check for traces of cocaine,cannabis and other drugs and check heart function, blood pressure etc,of drivers? I know of someone who drives. He's an ex LSD user. Flashbacks could happen while he's driving,causing him to lose control of his vehicle and cause an accident. Yet some on here don't seem to mind that,they just have a bee in their bonnet about someone legally driving with restricted vision.
The Dvla are responsible for issuing the licences and have certain criteria relating to known medical issues. Heart problems , eyesight, epilepsy amongst others.
Driving whist under the influence of drugs alcohol etc are a police issue.
However, the phrase two wrongs dont make a right does spring to mind here.
As long as all the required declarations have been made to the DVLA and to Insurers without any ommissions and you still have a valid licence and insurance you are entitled to drive.
TBH as you have voiced concerns previously about your ability to drive , the arguments about other people still driving in a variety of conditions appear to just be a case of trying to justify ignoring your own concerns.
If you dont feel 100% competent , despite the legal position , dont drive.
I had a leg injury 4 years ago, not enough to meet the dvla or insurers criteria about reporting a disability bt a long way, but I still dont feel comfortable riding my motorbike, so I dont