Vitreous clouding refers to the appearance of opacities within the vitreous body, resulting in blurred vision, as if there are flying mosquitoes and dark shadows in front of the eyes, etc. It is mostly due to liquefaction of the vitreous body with age, posterior detachment, or vitreous inflammation, hemorrhage and other diseases. It has nothing to do with eye rolling. There are many causes of vitreous clouding. Physiologic vitreous clouding is mostly caused by age-related changes in the vitreous body and is common in the elderly. It usually does not affect vision, but it cannot be cured by itself. Inflammation, hemorrhage, trauma, foreign bodies, tumors, etc. can also lead to vitreous clouding, which can lead to blurred vision and visual impairment. Vitreous clouding should go to the hospital in time if vision loss occurs, improve the examination and active treatment.