Night Blindness - What causes night blindness?

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Night blindness (nyctalopia) is the inability to see well at night or in poor light. It is not a disorder in itself, but rather a symptom of an underlying disorder or problem, especially untreated myopia.

Night blindness is due to a disorder of the cells in the retina that are responsible for vision in dim light. It has many causes, including:

Myopia
Glaucoma medications that work by constricting the pupil
Cataracts
Retinitis pigmentosa
Vitamin A deficiency
To determine what is causing night blindness, an eye doctor will perform a thorough eye exam and may order any of a number of specialized exams.

How is night blindness treated?
Treatment for night blindness will depend upon its cause. Treatment may be as simple as getting a new eyeglass prescription or switching glaucoma medications, or it may require surgery if the night blindness is caused by cataracts