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What are the symptoms of night blindness?

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Symptoms of night blindness are poor vision in dim light or at night, according to MedlinePlus. People who have night blindness frequently have problems seeing when they walk from brightly lit areas into darkened ones. They may not be able to see well when driving at night or when viewing stars on clear nights. Retinitis pigmentosa and birth defects are nontreatable causes of night blindness. Nearsightedness, cataracts, using certain drugs and vitamin A deficiency are treatable causes of the condition.

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A comprehensive eye examination can establish the cause of night blindness and whether or not it is treatable, explains MedlinePlus. The examination includes pupil light reflex, examination of the retina, refraction and color vision testing. Visual acuity and slit lamp examinations are part of the exam process. The eye doctor may conduct an electroretinogram and visual field testing.

Unless patients with night blindness, or nyctanopia, have obtained their eye doctors' permission, they should not engage in night driving, notes MedlinePlus. Those patients with vitamin A deficiencies should ask their health care providers whether they need vitamin A supplements. Eye surgeons remove cataracts, which are clouded lenses, from the eyes to improve patients' vision. During the outpatient procedure, surgeons usually replace the lenses with artificial ones. If both eyes need surgery, the surgeons typically perform the second surgery one or more weeks after the first one.

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