Rhonda Patrick· PhD
So if you are inside your car and there is no direct sunlight falling on your face or inside your car and you're just driving, looking horizontally, then you're getting somewhere between 5,000 to 10,000 lux of light, which is similar to standing outside your car in a cloudy day, that's also 5,000 to 10,000 lux of light. So now, in a cloudy day or sitting inside your car, there is not enough UV light to hit your eye and damage your cornea or damage your skin. So in that case, driving without sunglasses is fine because you are not getting too much UV light exposure.