Night blindness is poor vision at night or in dim light.
Nyctanopia; Nyctalopia; Night blindness
Night blindness may cause problems with driving at night. People with night blindness often have trouble seeing stars on a clear night or walking through a dark room, such as a movie theater.
These problems are often worse just after a person is in a brightly lit environment. Milder cases may just have a harder time adapting to darkness.
The causes of night blindness fall into two categories: treatable and nontreatable.
- Use of certain drugs
Vitamin A deficiency(rare)
Take safety measures to prevent accidents in areas of low light. Avoid driving a car at night, unless you get your eye doctor’s approval.
Vitamin A supplements may be helpful if you have a vitamin A deficiency. Ask your health care provider.
Call your health care provider if
It is important to have a complete eye exam to determine the cause, which may be treatable. Call your eye doctor if symptoms of night blindness persist or significantly affect your life.
What to expect at your health care provider’s office
Your health care provider will examine you and your eyes. The goal of the medical exam is to determine if the problem can be corrected (for example, with new glasses or
The doctor may ask you questions, including:
- How severe is the night blindness?
- When did your symptoms start?
- Did it occur suddenly or gradually?
- Does it happen all the time?
- Does using corrective lenses improve night vision?
- Have you ever had eye surgery?
- What medications do you use?
- How is your diet?
- Have you recently injured your eyes or head?
- Do you have a family history of
- Do you have other vision changes?
- What other symptoms do you have?
- Do you have unusual stress, anxiety, or a fear of the dark?
The eye exam will include:
Color vision testing
Pupil light reflex
Slit lamp examination
Other tests may be done: