Floaters and Flashes in Vision: A Complete Guide

Floaters and flashes of light are two of the most common visual symptoms patients report. While usually harmless, the sudden onset of either — and especially both together — can indicate a serious retinal problem.

Understanding Floaters

Floaters appear as small spots, threads, cobwebs, or dots drifting across your vision. They are most noticeable when looking at bright, uniform backgrounds like a clear sky, white wall, or computer screen. The shadows they cast move as your eyes move, then drift slightly even when your eyes are still.

Understanding Flashes

Flashes appear as brief streaks or sparks of light, often in peripheral vision. They are most noticeable in dim lighting. Unlike migraine visual auras, true retinal flashes are usually brief and unilateral (in one eye at a time).

What Causes Them?

Both floaters and flashes usually arise from changes in the vitreous — the clear gel filling your eye. As you age, this gel liquefies and begins to pull away from the retina, a process called posterior vitreous detachment or PVD. PVD is very common after age 50 and typically harmless.

However, as the vitreous separates from the retina, it can tug on areas where it is firmly attached. This tugging produces flashes of light. If the tugging creates a tear in the retina, the tear can progress to a retinal detachment.

When They Are Harmless

A few floaters that have been stable for years are generally benign. Occasional brief flashes that don't recur may simply reflect gentle vitreous movement. Floaters that slowly decrease in number over weeks to months are typical of resolving PVD.

When They Are an Emergency

Any sudden shower of new floaters, especially accompanied by flashes, requires same-day examination. A dark curtain or shadow moving across vision indicates retinal detachment. Flashes that continue for weeks may indicate ongoing retinal traction.

What to Expect at Evaluation

A dilated retinal examination is essential. The doctor looks for retinal tears, detachments, or other pathology. If a tear is found, it can often be sealed with laser or cryotherapy in the clinic. If detachment has occurred, surgery is needed promptly.

Get Evaluated at Kenz Eye Care

If you are experiencing new floaters or flashes, don't wait. Call Kenz Eye Care at 93927 01759 for an urgent retinal evaluation in Kokapet.