Sparks in front of the eyes or flashes of light in front of the eyes are clinical diagnostic signs of temporal arteritis. Temporal arteritis, also known as cranial arteritis, is named after the anatomical site. It is an inflammatory disease of the large and medium arteries and can involve multiple sites of arteries, but all have temporal artery damage. It is characterized clinically by headache, fever, eye pain, generalized pain and progressive visual impairment or even blindness. The disease is closely related to rheumatic polymyalgia. Tests needed for sparking or flashing in front of the eyes: 1. X-ray: angiography may reveal segmental stenosis or occlusion of the relevant branches of the internal and external carotid arteries and the relevant branches of the aorta. 2.Other: Some patients may have EEG abnormalities. 3. Histopathologically: The disease is a kind of total arteritis, and the most important pathological features are: 1) There is a specific site of predilection. (2) The arterial involvement is limited and segmental in distribution, forming a jump phenomenon. (3) Inflammatory cell infiltration vasculitis throughout the diseased vessel, especially in the intima, manifested by infiltration of lymphocytes, plasma cells, and mononuclear macrophages, and degeneration of the outer membrane of the muscular layer, most of which is destroyed. (4) The elastic layer of the vessel wall is formed by giant cells with hairy glass-like degeneration and collapse of elastic fibers, and the giant cells contain degenerated and sometimes calcified elastic fibers. Proliferation of the middle layer fibers is also a characteristic pathological change of this disease. (5) Endothelial hyperplasia, wall thickening, luminal narrowing or occlusion and thrombosis of the lesioned vessels are seen, with ischemic or infarctive histological changes in the surrounding tissues associated with the damaged vessels, accompanied by round cell infiltration of the vascular trophoblastic layer, and the lesion may occur along the course of the artery with patchy isolated disease.