If there are dark shadows in the eyes, it is more likely to be caused by vitreous clouding, and it cannot be ruled out that it is caused by vitreous hemorrhage. Vitreous humor is a transparent tissue, once because of vitreous degeneration or hemorrhage and other reasons lead to the formation of opaque material inside the vitreous humor, will cause the patient’s field of vision with dark shadows fluttering. Vitreous clouding is the most common. Vitreous clouding is most common in patients with high myopia and is associated with aging. Vitreous hemorrhage may also cause dark shadows to float in front of the eyes. A small amount of hemorrhage is characterized by point-like dark shadows, while a large amount of hemorrhage will usually cause significant vision loss. Patients can confirm the diagnosis by going to the ophthalmology department of the hospital for a detailed fundus examination and ophthalmic ultrasound examination. And under the guidance of the doctor for treatment.