If your health care provider thinks that you have CRAO, he or she will do a physical exam of the eye. Your eye will be dilated first. Your health care provider may also do a number of other eye tests. These are done to find out the type of blockage and how much damage you have. One eye test that can make a clear diagnosis is called a fundoscopy. This test is sometimes done with a biomicroscope and slit lamp.

You will be tested for high blood pressure, glaucoma, and diabetes. If you are young, your health care provider may check whether your blood is thicker than normal. This can be done with a blood test called a complete blood count.

Your health care provider may also make other checks of your heart health to see if you have problems with clotting elsewhere. These health problems are often related.