Each of us from grandmothers heard and it also really irreproachably sounds from the medical point of view that it is necessary to eat a carrot to see in the dark. About night blindness there are mentions in the Egyptian papyruses. Ancient doctors ordered to eat a liver of a bull for the patients who were suffering this illness.
The modern medicine knows that the liver, whether it is a liver of a bull, the calf, a bear or a cod, contains considerable amount of vitamin A. And if there’s deficiency of vitamin A at patients such symptoms as sight easing in the dark are often observed. Deficiency of vitamin A can provoke also development dryness of eyes, up to the appearance of corneas, sensitivity infringement, reddening and swelling of eyelids and also dryness and turbidity of a cornea.