Anyone who drives at night knows the problem. An approaching car rounds a bend or crests a hill and a dazzling glare fills the windscreen and you can’t see.
It is extremely frightening and several seconds may elapse before your night vision recovers — putting your own life and those of other road users in danger.
The phenomenon is being blamed on carmakers fitting ever more powerful headlights as a ‘safety’ marketing feature. But research shows that because of the basic mechanics of our eyes, the older you are, the easier it is to be temporarily blinded.