257. 夜盲症
夜盲症(nyctalopia)は、暗闇や低照度で視力が低下する状態です。夜間や薄暮時に歩行者、自転車、路面標示、カーブ、障害物を認識しにくくなります。眼疾患、ビタミン不足、網膜の問題など原因はさまざまです。暗い場所で見えにくい運転者は、視力が不十分な条件での運転を避け、眼科など専門的な診察を受けます。
What is night blindness?
Night blindness is difficulty seeing in darkness or low-light conditions, even when daytime vision may be relatively good.
Why is night blindness dangerous when driving?
It can make pedestrians, cyclists, road edges, signs and obstacles harder to detect, reducing the time available to react safely.
Is night blindness the same as being completely blind at night?
No. Night blindness usually means reduced vision in dim conditions, not a complete loss of sight.
What can cause night blindness?
Possible causes include retinal disorders, cataracts, certain inherited eye conditions and some nutritional deficiencies. An eye-care professional can determine the underlying cause.
Can glasses correct night blindness?
Glasses may help when poor low-light vision is partly caused by an uncorrected refractive error, but not every cause of night blindness can be corrected with glasses.
Should you drive at night if you have night blindness?
If your low-light vision is not sufficient for safe driving, you should avoid driving at night or in other dark conditions and seek medical advice.

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