Vitamin B12 deficiency: An ‘alarming’ sign in your eyes of a deficiency – are you at risk?

Vitamin B12 is a crucial ingredient for the healthy running of the body, as it’s needed to make red blood cells. Signs of a deficiency can develop very slowly, so it may be difficult to diagnose the condition.

People with undiagnosed symptoms should consider that they may have a vitamin B12 deficiency.

While it’s unlikely that your symptoms are caused by the condition, there are still many people that have a lack of B12.

A quick blood test could reveal whether you should be adding more B12 to your diet.

You may be at risk of the condition if you start to develop a blurred vision, it’s been revealed.

Changes to your eyesight may be caused by not getting enough vitamin B12 in your diet.

Some patients may find that their eyesight becomes increasingly blurry.

Vitamin B12 plays a role in keeping the nervous system healthy.

A B12 deficiency, however, can cause damage to the optic nerve as a result of nervous system changes.


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“One symptom of vitamin B12 deficiency is blurred or disturbed vision,” said dietitian Helen West.

She told medical website Healthline: “This can occur when an untreated B12 deficiency results in nervous system damage to the optic nerve that leads to your eyes.

“The damage can disrupt the nervous signal that travels from your eye to your brain, impairing your vision. This condition is known as optic neuropathy.

“Although alarming, it is often reversible by supplementing with B12.”


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Blurred vision may impact your entire eyesight, or just small parts of your field of vision.

It may also affect just one of your eyes, and can make objects appear clouded.

But, just because you develop blurry vision, it doesn’t necessarily mean that you have a vitamin B12 deficiency.

Blurred vision could also be caused by cataracts, migraines, or an injury to the eye.


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More common warning signs of a vitamin B12 deficiency include tiredness, jaundice, and feeling dizzy.

You should speak to a doctor if you’re worried about vitamin B12 deficiency symptoms.

But you can top up on the vitamin by eating certain foods.

The best sources of vitamin B12 include beef, liver, dairy foods, eggs, and salmon.

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