How does nutrition support healthy vision?
The retina has high energy demands and relies on a steady supply of oxygen, vitamins, minerals and other nutrients. Vitamin A supports the visual cycle and is especially important for seeing in low light. B vitamins, vitamin C, vitamin E, zinc and omega-3 fatty acids also play roles in general eye and body health.
A nutrient deficiency does not explain every change in vision. Age, diabetes, high blood pressure, smoking, family history and other eye conditions can affect sight even when the diet is adequate.
Nutrients commonly discussed in eye health
- Vitamin A: supports the visual cycle and the surface of the eye
- B vitamins: help normal nerve and cellular function
- Vitamin C and vitamin E: contribute to antioxidant protection
- Zinc: supports retinal function and vitamin A metabolism
- Omega-3 fatty acids: support cell membranes and general health
Food sources for a balanced diet
Colourful vegetables, leafy greens, fruits, pulses, whole grains, nuts, seeds, eggs, dairy, fish and other protein sources can contribute to a varied, nutrient-rich diet. The right choices depend on a person's age, medical conditions, dietary pattern and nutritional needs.
Who may be more at risk of deficiency?
- People with a very restricted or unbalanced diet
- People with digestive or absorption problems
- People with certain chronic illnesses or increased nutritional needs
- Older adults who eat less or have difficulty preparing meals
- People taking medicines that affect nutrient absorption
Can vitamins prevent eye disease?
Supplements may be useful when a genuine deficiency is diagnosed or when a clinician recommends them for a specific reason. More is not always better, and high-dose supplements can interact with medicines or cause harm.
They should not delay care for symptoms such as sudden vision loss, flashes, a curtain, persistent distortion or new blurred vision. If you have diabetes, high blood pressure or a family history of retinal disease, regular eye examinations are just as important as a healthy diet.
When should you see an eye specialist?
Book an eye examination for persistent blurred vision, difficulty seeing at night, new distortion, frequent eye strain or any change that is different between the two eyes. Seek urgent care for sudden loss of vision, a curtain or shadow, flashes and a sudden shower of floaters.
