Floaters and flashes are most commonly caused by posterior vitreous detachment (PVD), a natural age-related process in which the gel-like vitreous separates from the retina. PVD typically develops over days to weeks and may be associated with both floaters and flashes (also called photopsias). While PVD itself is usually benign, it can occasionally be associated with retinal tears, which is why a prompt retinal examination is essential when new symptoms appear.

Once the retina has been carefully examined and no tears are present—or any tears have been treated—floaters often persist for a variable period of time. In many patients, floaters gradually settle outside the central visual axis, and the brain adapts to their presence. However, some individuals experience persistent floaters in central vision that cause ongoing visual disturbance or distraction.

For patients with significant, persistent symptoms, treatment options may be considered. YAG laser vitreolysis is an office-based procedure that can reduce certain isolated floaters, but it is not effective for clusters of floaters and may not fully eliminate symptoms in many patients. In selected cases, vitrectomy surgery may be recommended. During vitrectomy, the vitreous gel is removed and replaced with natural eye fluid. This procedure can provide the most complete relief from floaters but carries surgical risks, including increased cataract progression and a very small risk of infection. Treatment decisions are individualized based on symptom severity, eye anatomy, and patient preference.

Because flashes and floaters can sometimes signal serious retinal problems, new or sudden onset symptoms should always be evaluated urgently.