A well-made the iris eye will last, on average 3 years.
For most patients this is true. For some people, it will last even longer and for some, it lasts less. Children, for instance, go through dramatic growth changes and we have to catch up with those changes. Other patients need additional surgery that changes the shape of their socket. While at times we can accommodate for the change with a refit, other times the change is so drastic, a new prosthetic eye will yield the best result in Comfort and Cosmesis.