Ocular floating phenomenon: colorless and transparent colloid filling the posterior 4/5 cavity of the eye, mainly with collagen fibrils and a colloid composed of 98.5%-99.7% water. The vitreous itself is not vascular, metabolism is very low, its nutrition from the choroid and atrial aqueous. The vitreous body is susceptible to various physical, chemical, trauma, inflammatory-like disease, degenerative degeneration, etc., decomposition occurs, the phenomenon of liquefaction. It is manifested as floaters in various forms such as dotted, linear, and cobweb-like in front of the eye, and floats up and down with the eye movement. So, what are the pathological causes of the floating eye phenomenon? Here is a brief introduction. Pathological causes ① Uveitis, inflammatory exudate and inflammatory cells into the vitreous to form grayish-white dusty, flocculent or clumpy clouding. ②Hemorrhage, due to retinal phlebitis, venous obstruction, diabetes, hypertension, trauma or surgery caused by hemorrhage into the vitreous, in the process of blood entry and absorption to form red, yellow, gray-white flocculent or mass clouding. ③Pigment, trauma, uveitis, etc. make pigment particles into the vitreous. ④Parasites and their metabolites, intraocular tumors or ocular metastases of tumors from other parts of the body, causing cloudiness. ⑤ Foreign body retained in the vitreous from eye trauma. (6) Intravitreal fibrous tissue proliferation due to ocular trauma, hemorrhage, diabetes, etc. (7) Vitreous degeneration, most commonly seen in the elderly and highly myopic patients, where vitreous hyaluronic acid is depolymerized and liquefied. Cholesterol crystals may be deposited in the vitreous in diabetic and hypercholesterolemic patients.