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Vitreous syneresis is the age-related breakdown of the vitreous gel inside the eye. The gel becomes more liquid and collagen fibers clump together, which can cast shadows seen as floaters. As the vitreous shrinks, traction on the retina can trigger flashes of light. Vitreous syneresis is common and is often an early step before posterior vitreous detachment.
read more about syneresis vitreous ...Aging is the most common cause, as the vitreous slowly liquefies and contracts over time. Nearsightedness can speed up vitreous changes because the eye is longer and the vitreous can shift more. Prior eye inflammation, trauma, or eye surgery can also change vitreous structure and lead to earlier syneresis. Diabetes and other systemic conditions can be linked with vitreous changes, especially when ocular disease is present. Vitreous syneresis can occur without a clear trigger beyond normal aging.
Floaters are the most common symptom and can look like spots, strings, or cobwebs drifting across vision. Flashes of light can occur when the shrinking vitreous tugs on the retina. Symptoms often become more noticeable against bright backgrounds such as a white wall or blue sky. Sudden onset of many floaters can feel alarming and needs evaluation because a retinal tear is possible. Pain is not typical, so eye pain with floaters suggests a different eye problem.
Diagnosis starts with a dilated eye exam to inspect the vitreous and carefully check the retina for tears, holes, or detachment. A clinician often examines the peripheral retina with special lenses because tears can hide in the far edges. When the retina view is limited, ultrasound imaging can help confirm vitreous changes and check for detachment. The exam also looks for pigment cells or blood in the vitreous, which can signal a retinal break. Follow-up is sometimes scheduled because a tear can develop after new symptoms begin.
Most cases do not need treatment, and floaters often become less noticeable as the brain adapts. Urgent treatment is needed when a retinal tear or detachment is found, because that changes the plan entirely. For severe, persistent floaters that interfere with daily life, a retina specialist can discuss options such as vitrectomy, with careful risk discussion. Laser vitreolysis is used in some settings, though suitability depends on floater type and eye anatomy. The safest step for new floaters or flashes is a prompt dilated exam.
No. Vitreous syneresis describes liquefaction and shrinkage of the vitreous gel. Posterior vitreous detachment occurs when the vitreous separates from the retina, and syneresis often happens first. An eye exam can confirm which stage is present.
Yes. Collagen clumps and pockets of liquefied gel can cast shadows on the retina that appear as floaters. Floaters often shift with eye movement and drift out of view. New or sudden floaters still need an exam to rule out a tear.
Floaters often become less noticeable over weeks to months as the brain adapts and the clumps settle. Some floaters persist long term, especially larger strands. A retina specialist can discuss options when floaters remain very disruptive.
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Posterior Vitreous Detachment. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/what-is-posterior-vitreous-detachment. Date Accessed February 4, 2026.
Eye Floaters and Flashes. American Academy of Ophthalmology. https://www.aao.org/eye-health/symptoms/flashes-floaters. Date Accessed February 4, 2026.
Posterior Vitreous Detachment. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK563273/. Date Accessed February 4, 2026.
Posterior Vitreous Detachment (PVD). EyeRounds (University of Iowa). https://eyerounds.org/tutorials/pvd/index.htm. Date Accessed February 4, 2026.