Drivers who see blurred headlights or halos around lights are being urged to get their eyesight checked.
Adam Aslam, director at Nevies Opticians, said changes in vision can be particularly noticeable when motorists are driving after dark.
He said streaks, glare and blurred lights can have different causes and advised people whose sight is affected to ask an optometrist for advice.
One possible cause is astigmatism, a common condition that can make headlights, streetlights and road signs appear blurred or distorted, particularly at night.
The NHS says astigmatism can cause blurred vision, headaches and eye strain, and recommends visiting an optician if someone has symptoms.
It explains that astigmatism means the eye is shaped more like a rugby ball than a football, causing light to focus in more than one place in the eye.
It says the condition does not always need treatment, but glasses or contact lenses are among the options.
The NHS also advises going to an optician if you have not had an eye test for two years, and says regular tests are important.
Mr Aslam said: “Many people assume everyone sees headlights the same way they do, so they may not realise there could be an issue with their vision.
“If lights appear unusually bright, blurry or surrounded by halos, it’s worth booking an eye examination to have your vision checked.”
Even motorists with healthy vision can find driving after dark more challenging during the winter months, according to the optician.
He also shared five ways motorists can prepare for journeys in low light, including cleaning the inside as well as the outside of their windscreen.
Dust, residue and condensation on the glass can scatter light and make glare from oncoming headlights worse, he said.
His advice is to clean both sides regularly and clear condensation before setting off.
Mr Aslam also recommends avoiding a bright phone screen just before a journey and giving your eyes a moment to adjust to the dark.
He advises drivers not to use their phones while driving.
Changes in driving habits can be worth noticing, too.
According to Mr Aslam, of Nevies Opticians, avoiding unfamiliar routes or driving after dark, slowing down more than usual and relying heavily on road markings can be signs that vision has changed.
Anyone who has adapted their behaviour in these ways should consider an eye test, he said.
Repeated star-shaped lights, streaks or halos should not simply be assumed to be normal, particularly if they affect how clearly someone can see.
Motorists should also check that they have the right lights on, as daytime running lights often do not illuminate the rear of a car, according to Mr Aslam.
He recommends switching headlights on in poor visibility and using dipped beam when other road users are nearby.
The Highway Code advises drivers dazzled by oncoming headlights to slow down and, if necessary, stop.
Mr Aslam added: “People routinely service their cars, check their tyres and replace worn wipers, yet many overlook their eyesight.
“Your vision plays a huge role in how safely you drive, particularly during the darker months.
“If you’ve noticed changes in your sight, booking an eye test is a sensible step.”
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