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Vision - night blindness

Definition

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

Alternative Names

Nyctanopia; Nyctalopia; Night blindness

Considerations

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.

Causes

The causes of night blindness fall into 2 categories: treatable and nontreatable.

Treatable causes:

• Cataracts
• Nearsightedness
• Use of certain medicines
• Vitamin A deficiency (rare)

Nontreatable causes:

• Birth defects, particularly congenital stationary night blindness
• Retinitis pigmentosa

Home Care

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 how much you should take, because it is possible to take too much.

When to Contact a Medical Professional

It is important to have a complete eye exam to determine the cause, which may be treatable. Contact your eye doctor if symptoms of night blindness persist or significantly affect your life.

What to Expect at Your Office Visit

Your 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 cataract removal), or if the problem is due to something that is not treatable.

The provider 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 medicines do you use?
• How is your diet?
• Have you recently injured your eyes or head?
• Do you have a family history of diabetes?
• 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
• Refraction
• Retinal exam
• Slit lamp examination
• Visual acuity

Other tests may be done:

• Electroretinogram (ERG)
• Visual field

References

Cao D. Color vision and night vision. In: Sadda SVR, Sarraf D, Freund KB, et al, eds. Ryan's Retina.7th ed. Philadelphia, PA: Elsevier; 2023:chap 11.

Cukras CA, Zein WM, Sieving PA. Progressive and "stationary" inherited retinal degenerations. In: Yanoff M, Duker JS, eds. Ophthalmology. 6th ed. Philadelphia, PA: Elsevier; 2023:chap 6.12.

Thurtell MJ, Prasad S, Tomsak RL. Neuro-ophthalmology: afferent visual system. In: Daroff RB, Jankovic J, Mazziotta JC, Pomeroy SL, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 16.

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