Final answer:
Exophthalmos, or protrusion of the eyeball, is often caused by edema (fluid accumulation) in the tissues behind the eye. This typically happens as a result of an abnormal immune response found in conditions such as Graves' disease. Edema can be caused by a variety of conditions or medications and typically causes swelling and discomfort.
Step-by-step explanation:
The statement that the protrusion of the eyeballs, exophthalmos, is caused by edema in the tissues behind the eye is true. Exophthalmos, or Graves ophthalmopathy, is often a symptom of Graves' disease. In this condition, there is an accumulation of fluid known as edema in the tissues behind the eyeball, typically as a result of an abnormal immune response. This causes the eyeballs to protrude unusually from the eye sockets.
It's important to note that edema, the accumulation of excess water in tissues, can be a symptom of a variety of medical conditions or even the outcome of certain medications or injuries. Edema often results in swelling and discomfort in the affected areas. In relation to the eye, it can push the eyeball forward, hence causing the visible protrusion seen in exophthalmos.
Learn more about Exophthalmos & Edema