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Vision - night blindness

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External and internal eye anatomy

External and internal eye anatomy

Vision - night blindness

Definition:

Night blindness is poor vision at night or in dim light.

Alternative Names:
Nyctanopia; Nyctalopia; Night blindness
Considerations:

Night blindnessmay cause problems with driving in the evening or at night. Consult your health care provider or eye doctor. It is important to have a complete eye exam to determine the cause, which may be treatable.

Common Causes:

Cataracts (usually in older persons)
Retinitis pigmentosa (may be the first sign of the disease in a young person)
Poor adaptation to darkness (not caused by any disease), often accompanied by myopia (nearsightedness)
Vitamin A deficiency
Certain drugs
Birth defect

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