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    Ingredient guide · Ingredient reference

    Which deficiency causes night blindness? Vitamin A is one cause

    Vitamin A deficiency can impair vision in dim light. Night-vision problems can also come from eye conditions, so they need an eye examination rather than automatic high-dose supplementation.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Vitamin A supports the low-light visual system

    ODS identifies night blindness as an early eye manifestation of vitamin A deficiency, associated with inadequate retinal visual pigment. More advanced deficiency can damage the eye. This is a genuine deficiency effect, not evidence that extra vitamin A improves normal night vision. [1]

    The symptom has a wider differential

    MedlinePlus lists cataracts, nearsightedness, some medicines and inherited retinal conditions among other explanations. An eye examination is needed to distinguish them. A vitamin cannot be assumed to correct a lens or inherited retinal problem. [2]

    Address safety while arranging assessment

    Avoid night driving when vision is impaired unless your eye clinician approves it. Imagine increasing vitamin A while continuing unsafe night driving: neither the diagnosis nor the immediate risk is addressed. High-dose preformed vitamin A can be harmful, so deficiency treatment should be directed by the clinical findings. [2][1]

    Hypothetical example — use symptom context rather than guessing a missing vitamin
    SituationUseful distinction
    Vitamin A deficiencyOne recognized cause
    Cataract or retinal conditionDifferent explanation
    Impaired night drivingRequires immediate practical caution
    Which deficiency causes night blindness? Vitamin A is one cause — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Vitamin A and Carotenoids - Health Professional Fact Sheet
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. Vision - night blindness: MedlinePlus Medical Encyclopedia
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.