Yes, a lack of vitamin A severely affects your eyes, causing night blindness (difficulty seeing in low light) as the first sign, and progressing to severe dryness (xerophthalmia), corneal damage, and potentially permanent blindness if untreated, making it a leading cause of preventable childhood blindness worldwide. Vitamin A is crucial for producing pigments in the retina and moisture on the eye's surface, and its deficiency hinders these functions.
Without enough vitamin A, your eyes cannot produce enough moisture to keep them properly lubricated. Vitamin A deficiency is the leading cause of preventable blindness in children worldwide. An estimated 250,000 to 500,000 children become blind every year because of vitamin A deficiency.
Night blindness is one of the first signs of vitamin A deficiency. In its more severe forms, vitamin A deficiency contributes to blindness by making the cornea very dry, thus damaging the retina and cornea.
Because of the teratogenic effects secondary to excessive vitamin A intake, the WHO recommends as safe during pregnancy a maximum dose of up to 10,000 IU daily or 25,000 IU weekly after the first 60 days of gestation [10,12,38].
It's important to eat a diet that includes foods that have vitamin A, such as meat, dairy, dark leafy greens, and yellow or orange fruits and vegetables. In addition, you can get vitamin A from a dietary supplement if needed.
Major health organizations list thirteen vitamins:
Sweet potatoes and carrots are excellent sources of provitamin A carotenoids that are good for your eyes. From animal-derived foods is called retinol. This “pre-formed” vitamin A can be used directly by the body. Good food sources of retinol vitamin A include beef and chicken liver, whole milk and cheese.
Vitamins to avoid during pregnancy
You should avoid supplements and multivitamins containing vitamin A (retinol), as too much of it can harm your baby's development. Liver and liver products (including fish liver oil) are also high in vitamin A, so you should avoid these too.
Some studies have also linked riboflavin deficiencies to ophthalmological findings such as blurred vision. Most recently a study by Zhao et al, in 2022 reported on the possible association between riboflavin deficiencies and night-time blindness.
Vitamin A. Vitamin A, also known as retinol, produces the pigments in the retina of the eyes. More importantly, it is a vital nutrient for the photoreceptors in your eyes, which determine vision quality in low-light conditions.
“Timing-wise, there's no specific best time of day to take vitamin A. Just aim to take it with a food source that contains some fat to help your body absorb it properly,” says Lauren Manaker, M.S., R.D.N., L.D., a registered dietitian nutritionist and women's health expert.
Vitamin A deficiency is when you don't have enough vitamin A. This can lead to permanent blindness. However, vision loss from vitamin A deficiency can be reversed if treated quickly.
Symptoms
One of the most important vitamin A functions is its involvement in visual phototransduction, where it serves as the crucial part of photopigment, the first molecule in the process of transforming photons of light into electrical signals.
Mango and papaya are full of nutrients that help support healthy eyes. Two key nutrients are the antioxidants lutein and zeaxanthin. These act as a natural sunblock, absorbing excess light coming into the retina. They also protect the eye from harmful blue light.
Based on current research, it usually takes 1-3 months of consistent supplementation to correct a vitamin deficiency. If you're severely deficient in a vitamin, it may take longer to restore optimal levels. Keep in mind, there isn't a catch-all answer for how long it takes vitamins to kick in.
You can also get vitamin A by including good sources of beta-carotene in your diet, as the body can convert this into retinol. The main food sources of beta-carotene are: yellow, red and green (leafy) vegetables, such as spinach, carrots, sweet potatoes and red peppers. yellow fruit, such as mango, papaya and apricots.
Disorders that impair the intestine's absorption of fats can reduce the absorption of the fat-soluble vitamin A and increase the risk of vitamin A deficiency. These disorders include chronic diarrhea, celiac disease, cystic fibrosis, certain pancreatic disorders, and blockage of the bile ducts.
Vitamin and mineral deficiencies, including B2, B3, B5, B6, B9, B12, C, D, iron, and magnesium, are among the most common causes of unexplained fatigue. Vitamin D deficiencies affect over 50% of the global population, and approximately 12.5% have iron deficiency anemia.
Calcium and vitamin D supplementation is associated with decreased abdominal visceral adipose tissue in overweight and obese adults.
Vitamins A, D, E and K are fat-soluble; they need fat for absorption and can be stored in body tissues. Taking large doses of fat-soluble supplements is more likely to cause toxic effects.