Vitreous Floaters
Floaters appear as small dark spots, threads, or cobweb-like shapes that drift across your field of vision. They are caused by tiny clumps of cells or protein within the vitreous gel casting shadows on the retina. Floaters are extremely common, particularly in people over the age of 60, and in the vast majority of cases they are harmless. However, a sudden increase in floaters - especially if accompanied by flashing lights or a shadow across your vision - can indicate a posterior vitreous detachment (PVD) or, more rarely, a retinal tear, and should be assessed promptly.
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