Depending on the disease they are used to treat, they may contain drugs (antibiotic / steroid), or only solutions that wet or act as tears.
There are a wide variety of artificial tear eye drops that provide different approaches to surface healing.
Eye drops containing steroids and antibiotics are used to treat eye infections. They also have preventative properties and are used to prevent infections after eye surgery.
Eye drops used to help treat glaucoma promote better drainage of eye fluid and reduce the amount of fluid produced by the eye, which reduces eye pressure.
There are also other types of eye drops: for redness of the eyes, for allergies, for conjunctivitis, as well as drops for dilating the pupils.