Narrow-angle glaucoma, also called angle-closure glaucoma and closed-angle glaucoma, is caused by the forward movement of the iris. This movement obstructs the eye's drainage channel and causes pressure to build up in it. When this pressure is too high, it results in narrow-angle glaucoma.
Inflammation of the eye's middle layer, a tumor in the iris, a small eye and abnormal iris attachment can contribute to the development of narrow-angle glaucoma. People who are over 60 years old, are Asian, Hispanic or African-American or who are female are at higher risk for developing narrow-angle glaucoma as well as other types of glaucoma. Other risk factors for this condition include nearsightedness, family history of glaucoma and eye injuries.