The big picture: Officers are conducting voluntary roadside screenings in which drivers must read a number plate from 20m away, as research shows that 90% of the information used while driving is visual.
The vision tests are part of a broader two-week road safety initiative focusing on protecting vulnerable road users during darker evenings.
Why it matters: Under Cassie's Law, police can immediately revoke the licence of any driver failing these tests if they're deemed unsafe to be on the road.
The law is named after Cassie McCord, a 16-year-old killed by an elderly driver who had failed an eyesight test but refused to surrender his licence.
All tests are conducted in daylight conditions.
Drivers can use their usual eyewear during testing.
What they're saying: "As a responsible driver, it is key you monitor your eye health to ensure there is no impact on your ability to safely drive, both in daylight and darkness, seeking the advice of an optician if you notice any change/deterioration in your sight," said Chief Inspector Vicky McParland.
Tim Passmore, Police and Crime Commissioner for Suffolk, said: "Now that the clocks have gone back, I would urge everyone to take a little more care and for drivers to make sure both you and your vehicle are fit for winter conditions."
The bottom line: Drivers failing to meet required eyesight standards face potential fines, penalty points, or even immediate licence revocation, so wear your glasses or, if you struggle to read a number plate from 20m away, get your eyes tested.
