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Night vision is the eye's ability to adapt and function in dim light. It depends on rod cells in the retina, which are sensitive to light and motion but do not detect color. Good night vision allows people to move safely in the dark, detect shapes, and notice movement even when lighting is poor.
read more about night vision ...When light is low, rod cells become more active while cone cells, which handle color and detail, work less. The pupil widens to let in more light, and the retina becomes more sensitive. Full dark adaptation can take about 20 to 30 minutes after moving from bright light into darkness. Vitamin A plays a role in supporting the visual cycle that makes night vision possible.
Poor night vision can appear as trouble driving at night, needing more light to read, or difficulty recognizing faces in dim light. Glare and halos around headlights or streetlights are also common complaints. In some cases, people feel their eyes adjust too slowly when entering dark rooms.
Protecting night vision starts with healthy eye habits. Wearing sunglasses in the daytime reduces UV damage that can affect the retina. A balanced diet with vitamin A–rich foods, such as carrots, leafy greens, and sweet potatoes, supports the retina’s function. Regular eye exams catch conditions like cataracts or glaucoma early. Using proper correction for nearsightedness also improves nighttime clarity.
Vitamin A is necessary for rod cells to function in low light.
Aging reduces sensitivity in the retina and increases the chance of cataracts.
Contacts correct refractive errors, which improves clarity in low light, but they do not enhance natural night vision.
If you notice a significant increase in glare or halos around headlights at night, or if you feel unsafe driving after dusk, schedule an exam. These are common early symptoms of cataracts or changes in the retina that can often be treated to restore low-light clarity.