###Human: I have bulging eye problem for a year even after some treatment. Why? ###Assistant: Hello. The condition you have described is called proptosis. The most common cause of proptosis is thyroid abnormality (hyperthyroidism) and called thyroid eye disease (TED). In this condition, eye muscle gets enlarged due to GAG (glycosaminoglycans) material deposition. This condition usually resolves after active and quiet phase that takes up to five to seven years. During this time the actual cause is treated (hyperthyroidism) and for proptosis steroids may be given (that you have already taken). Enlarged muscles can compress the optic nerve and can cause permanent vision loss. So you need to consult an endocrinologist for the treatment of thyroid abnormality. Quit smoking (if you are a smoker) and keep follow your eye doctor to avoid complication that can cause permanent vision loss. You are welcome for any queries.