With people who stare at the computer screen all day long, the eyes are the organ that works the hardest. If not taken care, in long term, they may have to suffer from amblyopia or worse lose their vision. For that reason, they need to supply more of the following vitamins.
For your information, the chemical name of vitamin A is retinol. The process of vitamin A discovery derived from studies around 1906 and it was one of the first vitamins to be discovered. Vitamin A in the human body involves in visual activities and functions as cylindrical epithelial cell. One of the first symptoms of vitamin A deficiency is vision declining, namely mild visual impairment referred to as night blindness or dry eye disease.
Foods rich in vitamin A
Vitamin A is found in a variety kinds of foods such as: liver, egg yolk, butter, milk, cheese, spinach, some other green vegetables, squash, papaya, carrot, mango…However, since vitamin A is fat-soluble, emission of excess vitamin A absorbed from food is more difficult than other water-soluble vitamins such as vitamins B and vitamin C.Therefore, too many of these foods or other vitamin A supplements can lead to vitamin A poisoning. As a consequence, it causes nausea, jaundice, allergies, anorexia, vomiting, blurred vision, headaches or muscle and abdominal injuries as well as fatigue and personality change.
β – carotene
Beta carotene is one of more than 600 types of carotenoid existing in the nature. Carotenoids are the substances that are yellow, orange and red-like ones. For further information, it is found in plants and does not appear in any kind of animals and foods of animal origin. Beta carotene is also a precursor of vitamin A, nevertheless it not only possesses the benefits as vitamin A but also owns the other widely used biological functions.
Beta carotene deficiency can make your skin more vulnerable by the sun. Hence, in cosmetics to protect the skin, beta carotene is frequently used.
Some types of cancer such as lung cancer, gastric cancer will not considerably reduce the risk if the diet is deficient in beta carotene. That is because beta carotene reduces cancer markers in the development cycle of this type of cancer. Moreover, it also reduces the risk of cardiovascular disease.
You can choose food of high β – carotene content from vegetables especially green and yellow ones, or orange fruits such as carrots and spinach, lettuce, potatoes, sweet potatoes, broccoli…
Along with vitamin A and beta carotene, vitamin C is also very beneficial to the eyes. This antioxidant slows down the progression of cataract and improves vision. Foods rich in vitamin C to mention are cherry, followed by guava, peppers, persimmon, broccoli, strawberry, orange, kale, cauliflower and kiwi.