Oriental Shorthair Cat

　　The main symptoms of vitamin A deficiency are: inflammation of the eyes and nose, swollen eyelids, decreased vision, tofu-like eye discharge, sometimes the upper and lower eyelids sticking together. Feathers appear disheveled. Motor coordination issues. Some birds develop dry eye disease, or one eye socket may be sunken, but the eyeball is not yet damaged and vision remains. Severe cases may experience corneal perforation, causing aqueous humor leakage and blindness. Vitamin A deficient chicks may show slowed or halted growth.

　　Treatment: Vitamin A deficiency can be treated with fish liver oil; feed one drop of concentrated fish liver oil daily for three consecutive days for quick recovery (irreversibly damaged eyeballs cannot be cured). If there is eye discharge or sticky eyelids, 3% boric acid solution can be used for cleaning.

　　Prevention: Adding carrots, green vegetables, or fruits appropriately in the feed can prevent vitamin A deficiency. Fish liver oil can also be added, but improper use can lead to toxicity. (Source：PetsZone)