I can see clearly in the daytime, but at night I struggle to read road signs or see clearly while driving. Why does my vision worsen at night?

Question

Accepted Answer

Night vision problems may be caused by uncorrected refractive error, pupil dilation in low light, astigmatism, dry eyes, or early cataract changes. If glasses improve daytime vision but not nighttime clarity, the prescription or lens coating may need updating. A full eye exam is recommended.

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Question: I can see clearly in the daytime, but at night I struggle to read road signs or see clearly while driving. Why does my vision worsen at night?