Vitamin A is crucial to the everyday functioning of the body, according to the NHS.
It’s also known as retinol, and improves the immune system, while also boosting your vision in dark places.
But, if you don’t get enough Vitamin A in your diet, you could develop strange spots on your eyes.
“Vitamin A is necessary to produce rhodopsin, a pigment found in the retinas of the eyes that helps you see at night,” Petre wrote for medical website Healthline.
“When left untreated, night blindness can progress to xerophthalmia, a condition that can damage the cornea and ultimately lead to blindness.
Bitot’s spots appear as dry, triangular patches, with a distinctive layer of foam on the top.
But, eating more Vitamin A-rich foods could help to protect against the growths.
The very best sources of Vitamin A include cheese, eggs, oily fish, milk, and yoghurts.
Beta-carotene sources include green, leafy vegetables, carrots, red peppers, mango, and papaya.
Most people need between 0.6 and 0.7mg of Vitamin A everyday.
You should be able to get all the Vitamin A you need from your daily diet.