By the clocks to winter time starts one hour earlier a common problem: bad vision at twilight. At least one in five drivers has difficulty with the view when the light disappears.
Even a healthy eye looks slightly blurred in the twilight, the visual acuity decreases compared to normal day vision decreased by 90 percent. Guilt is the division of the visual cells in the retina. There are brightness at the cone cells actively produce and sharp, colorful images. little light is present, start the rod cells to work and care for black and white, less sharp images. This change will take time - until the rods have their maximum capacity, can take 45 to 60 minutes. Can accelerate the adaptation process of the eye cannot. The expert therefore recommends that all drivers take extra care on the road when it gets dark, especially for regular eye "TÜV".
Maximum power for the eye.
As the eye works in low light conditions at the limit of its capacity, any additional stress leads to difficulty in night vision. Such stress factors may be: Vitamin A deficiency, the working screen for too long, lack of sleep, nicotine and alcohol use, dry eyes, headache. A good vision during the day is still no guarantee of a normal vision at night. Because quite often it happens that even healthy eyes have difficulty adjusting to the existing lighting conditions. "However, anyone who feels dazzled by headlights from other cars or road signs cannot read can control his eyes”. Because they may have defective vision or eye problems like cataracts. Likewise, even diabetes or retinal degeneration lead to impaired vision.
Confusion with night blindness.
Vision problems in the twilight are often colloquially referred to as night blindness. A true night blindness (nyctalopia) is rare and is present only when the eye cannot adapt to dark lighting conditions in which a healthy eye still sees. Concerned actually see at night extremely difficult or even nothing. For the vast majority of these diseases but also the day vision is significantly impaired.
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