Astigmatism is caused by the abnormal curvature of the cornea, and headaches are a symptom of the disorder, the National Eye Institute explains. A cornea that is oblong, instead of round, changes the refractive angle of ... More » Health Conditions & Diseases

Astigmatism may be the result of an eye injury, disease or surgery, according to Mayo Clinic. Some people may have astigmatism present at birth. Despite speculation, squinting, reading in dim light or sitting too close t... More » Health Vision

Headaches are classified as either primary or secondary, and primary headaches are caused by problems with the structures in the head that are sensitive to pain. Secondary headaches are caused by any one of a number of u... More »

To test for astigmatism, doctors typically perform a vision test, measure the curvature of the patient's cornea and measure the light focus of the eye, according to Mayo Clinic. All tests occur during an eye examination. More » Health Vision

Astigmatism is a visual disorder that causes blurred vision due to the irregular shape of the cornea or uneven curvature of the lens inside the eye. The cornea and the lens are responsible for focusing light entering the... More » Education

Fuchs' disease, also known as Fuchs' dystrophy, is a disorder of the cornea, the clear, rounded window on the eye, that causes it to swell, Mayo Clinic explains. Fuchs' disease can enhance glare, cloud vision and cause d... More » Health Conditions & Diseases

Pulsating headaches are associated with migraines, cluster headaches and tension headaches, explains the Miami Headache Institute. The most common causes of these headaches are depression, anxiety, head injury, lack of s... More »