Cyclosporine is a polypeptide agent originally isolated from a fungus. Originally, cyclosporine was compounded with virgin olive oil or purified corn oil and used as a topical eye treatment. 
It is primarily used to suppress the immune system, and has been extensively used in people to prevent organ rejection following transplantation.
In dogs, cylcopsporine has been shown to increase tear production, possibly by stimulating the tear gland.
Cyclosporine, when applied to the eyes, can reduce scar tissue and pigment that has developed due to disease.

Please keep in mind the information provided for this product is for reference only. Always consult your veterinarian to make sure this product is appropriate for your pet. Before administering be sure to thoroughly read the product label and package insert for a more complete description regarding the proper use of this product.