1.) The definitive host sheds the fully-embryonated egg into water by means of flushing the eye with water if it is a human host or by the body’s immune system causing the eye to water in avian hosts.
2.) Once in water the miracidia hatch immediately and penetrate the snail by two glandular ducts on each side of the apical gland
3.) The miracidia inside the snail turn into cercariae
4.) Snails release the cercariae and they began to form cysts on aquatic vegetation
5.) A wild bird or human becomes infected with the parasite when they ingest the metacercariae
6.) Inside the host’s mouth the cysts open and the parasite travels to the eye using its two suckers
7.) In the host’s eye the parasite lives until it is flushed out with water and then starts the cycle again