Vitreous turbidity manifests as black spots, filaments, flocculent floaters in front of the eyes, and in severe cases manifests as a significant obscuration. Vitreous turbidity is not a separate disease, but a sign, or clinical manifestation, of various ophthalmic diseases. The normal vitreous humor is clear and gel-like, like jelly. Various causes can cause the vitreous humor to liquefy, where the collagen becomes analyzed and the cloudy material floats in the eye and exhibits symptoms. Vitreous turbidity is commonly seen in the following conditions: 1, flying mosquitoes: vitreous physiological or disease leading to liquefaction, age and high myopia is the most common cause. Floaters are mostly translucent, varying in shape, not easily detected in the dark, and obvious against a white wall or sky and other pure background. No change in vision, stable for a long time, no need for treatment, drugs basically cannot eliminate. 2, posterior vitreous detachment: the vitreous body is attached to the surface of the retina, with age or myopia and other conditions when the vitreous body liquefies, when the vitreous body and the retina are separated, can suddenly occur floating objects in front of the eyes, some people will be accompanied by a sense of flash in a certain direction, often in the case of shaking the head, sudden turning, eye rotation, etc., can disappear on its own, may also persist. Mostly seen in middle-aged and elderly people, it is a normal age-related change, and most of them are stable for a long time. The cloudiness in this condition usually does not require medication and is difficult to eliminate by treatment, but only needs to be observed. A small percentage of people may experience a retinal fissure or retinal detachment that affects their vision during this period. In this case, there is likely to be a sudden increase in floaters compared to the previous period, a patchy darkness or blocking sensation in one direction, and some people may describe a feeling of not being able to lift their eyelids or a feeling of hair blocking them when they are not. All new occurrences of floaters in front of the eyes, flashing sensations, blocking sensations, or even loss of vision should be seen immediately, with dilated pupils for fundus or ultrasound examination. If there is no problem, it is also important to cover both eyes separately often to check for abnormalities in seeing and to follow up promptly to rule out possible retinal tears. Newly occurred posterior vitreous detachment should avoid strenuous activities or sudden turning, head shaking, frequent head nodding, etc. in addition to eye examination. Acute posterior vitreous detachment can also occur during head bumps, most commonly in young people during ball sports, when retinal fissures may occur, but retinal detachment may not be detected until weeks or months later. 3. Various causes of intraocular hemorrhage, intraocular inflammation, ocular trauma, post-operative eye surgery, and tumors may also manifest intraocular clouding and floaters, which require ophthalmologists to choose different treatments according to the situation. 4, vitreous degeneration will also show vitreous clouding, generally does not affect the vision, no special treatment. As long as the fundus can be seen clearly, dilated fundus examination is still the most important examination. Ultrasound has a limited role in the diagnosis of vitreous turbidity, as even in normal people, an intravitreal echogenic signal, known as “vitreous turbidity”, can be detected. Ultrasound does not clarify the nature of the clouding, but is still an important follow-up method for some patients who cannot dilate their pupils or have cataracts or intraocular bleeding. Once a vitreous clouding is detected, an ophthalmic system should be examined to rule out diseases that may be harmful to vision. The vast majority of patients will be stable over time without treatment, and regular follow-up is more important than the application of medications.