Posterior vitreous detachment is a disease of the fundus due to aging. As we age, the vitreous tissue inside the eye, which plays a supporting role, gradually liquefies, while the posterior border membrane of the vitreous body gradually separates from the retina and becomes suspended inside the eye, which is called posterior vitreous detachment. Posterior vitreous detachment does not usually affect vision, but there may be symptoms such as dark shadows floating in front of the eyes or water ripples floating in front of the eyes, which can be confirmed by detailed funduscopic examination and ophthalmic ultrasound examination. Simple posterior vitreous detachment does not require treatment, but patients need to avoid strenuous exercise to prevent the incompletely detached vitreous from pulling and tearing the retina, causing retinal detachment. Although posterior vitreous detachment does not require special treatment, fundus examination is needed for early detection of its complications – retinal tears or retinal detachment.