總結

• Can be caused by many disease processes, both inherited and acquired. Differentials that may cause blurred vision made worse by low light levels (e.g., cataracts, myopia, glaucoma) need to be distinguished from true night blindness.
• Most commonly reported by patients with inherited retinal or choroidal dystrophies; rarely associated with an underlying malignancy.
• Slit-biomicroscopy and electroretinography are often essential in narrowing the differential diagnosis.
• Vitamin A (retinol) deficiency can cause night blindness and is often overlooked in patients with malabsorption and malnutrition.
• Vitamin A (retinol) may be used to treat both genetic and acquired night blindness.