Personal experience has taught this author that exophthalmos sometimes becomes less marked as the patient grows older. The size and location of the nasopharynx causes vertical compression of the nasal passages, often leading to a reduced airflow through nose breathing. Another facial symptom common in Crouzon is the large jaw. The large jaw is probably the Crouzon symptom most easily correctable by surgery. Crouzon Syndrome frequently causes disorders related to auditory canals which may lead to hearing loss.
Sleep apnea is also extremely common.
Once reported in textbooks as a condition unassociated with non-craniofacial deformities, it has now been linked to other symptoms as well. Specialists are still trying to isolate the symptoms caused by Crouzon Syndrome from symptoms caused by unrelated conditions. Not as such. The premature fusion of sutures can cause life-threatening damage, but advances in surgical technique have significantly reduced the inherent dangers. With rare exceptions, Crouzon Syndrome does not interfere with basic body processes and should not reduce one's lifespan.