Thus, it is natural for the body to try to destroy a transplant that is foreign because it comes from another person's body. This is the process called transplant rejection. If a corneal transplant rejects, it loses its clarity and swells. Often, corneal transplant rejection can be stopped with medication, but rejection is always a possibility for the rest of the patient's life. If a transplanted cornea is rejected, another transplant may be done.
All surgery has some inherent risks.
Many of those risks are beyond the scope of a file such as this.