Vitreous detachment: symptoms, treatment, and when to worry
Last updated September 3, 2026.
Posterior vitreous detachment (PVD) is when the gel inside the eye shrinks and separates from the retina, a normal aging change that most people over 60 experience. It announces itself with a sudden increase in floaters and sometimes flashes of light. PVD itself is harmless and needs no treatment, but the same event occasionally tears the retina, which is why every new case earns an urgent eye examination.
What does it feel like?
Over hours or days: new floaters, dots, threads, a cobweb, or one large ring-shaped floater, drifting across vision, most visible against bright backgrounds. Flashes of light at the edge of vision, like a camera flash or lightning, may come and go for weeks. Vision itself stays normal in uncomplicated PVD. The symptoms then settle: the brain learns to ignore the floaters, and the flashes fade as the gel finishes separating.
What actually helps?
- The urgent first check: every sudden increase in floaters or flashes gets a dilated eye examination within about 24 hours, because the exam is what separates harmless PVD from the retinal tear that rides along in a minority.
- Then patience: uncomplicated PVD needs no treatment. Floaters become less noticeable over months as the brain adapts and they drift out of the central view.
- Know the second alarm: after a clear first exam, the retinal risk is mostly in the following weeks, so new symptoms during that window mean a repeat urgent check.
- Coping with persistent floaters: most people adapt fully; for the rare person with large persistent floaters severely affecting vision, specialist options exist but are chosen cautiously.
- No prevention needed or possible: PVD is the eye's normal aging, like grey hair, and its occurrence is not a sign of disease or of anything you did.
When is it an emergency?
The examination itself is urgent: a sudden burst of floaters or flashes earns an eye check within a day, and certain signs escalate to now: a dark shadow or curtain over any part of vision, a sudden drop in vision, or a fresh surge of floaters after an initial settling. Those mean possible retinal tear or detachment, which is a same-day emergency. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
Is a vitreous detachment dangerous?
The detachment itself, no: it is a normal aging event, and most people over 60 have one. The danger is the fellow traveler: in a minority of cases the separating gel tears the retina, and a tear left unsealed can progress to retinal detachment. That single fact drives the rule: every sudden increase in floaters or flashes gets an urgent dilated eye exam, because the exam is the only way to know which version you have.
Will the floaters from PVD go away?
Mostly, in effect. The floaters do not dissolve, but they settle lower in the eye and, more importantly, the brain learns to filter them out, so within months most people notice them rarely, mainly against bright skies and white walls. A small number are left with large, central, persistent floaters that genuinely impair reading or driving; those few can discuss specialist options, chosen carefully because the procedures carry real risk.
What is the difference between PVD and retinal detachment?
PVD is the gel peeling off the retina; retinal detachment is the retina peeling off the eye wall. The first is common and harmless, the second is an emergency that costs vision. They share the announcement, floaters and flashes, which is exactly why PVD symptoms earn an urgent exam. The dividing symptom is the shadow: a curtain or dark sector over vision, or a drop in vision, points to the retina and means same-day care.
Why am I seeing flashes of light?
The flashes are mechanical: as the shrinking gel tugs on the retina, the retina reports the tugging as light, since it knows no other language. They appear at the edge of vision, often in the dark or with eye movements, and fade over weeks as the separation completes. New flashes plus a floater shower is the combination that earns the urgent check; flashes that persist beyond the settling period or return freshly are worth re-examination.
Who gets posterior vitreous detachment?
Almost everyone eventually: it is part of normal eye aging, typically arriving in the 50s to 70s, earlier and commoner in short-sighted people, and after cataract surgery or eye injury. Having it in one eye makes the other more likely within a couple of years. It is not caused by screen use, reading, or strain, and nothing you did or skipped brought it on.
Do I need a follow-up after a normal PVD exam?
Yes, typically one or more re-examinations over the following weeks, because a retinal tear can develop after the initial event. The window of higher risk is roughly the first six weeks. Between appointments, you are the monitor: a fresh surge of floaters, returning flashes, any shadow or curtain, or a drop in vision means an urgent repeat visit rather than waiting for the scheduled one.