Vitreous detachment: is it serious?

Posterior vitreous detachment (PVD) is a natural part of the eye’s ageing process: the gel that fills the globe separates from the retina. It presents as the appearance of floaters (“floating spots”) and sometimes flashes of light. Usually benign, it nonetheless calls for a fundus examination because, more rarely, it may be accompanied by a retinal tear that needs to be watched closely.

UNDERSTANDING

What is the vitreous and its posterior detachment?

The vitreous is the transparent gel that fills the cavity of the eye, between the lens at the front and the retina at the back. Composed of more than 98% water, together with collagen fibres and hyaluronic acid, it gives the eyeball its shape and consistency. At birth, this gel is firm and adheres closely to the surface of the retina.

Over the years, the vitreous changes: it gradually liquefies (a process known as syneresis) and loses its uniformity. Pockets of fluid form within the gel. This evolution is a physiological process, common to all ageing eyes.

Posterior vitreous detachment, abbreviated to PVD, corresponds to the moment when the posterior part of the gel separates from the surface of the retina. As it shrinks, the vitreous detaches its membrane (the posterior hyaloid) from the underlying retina. It is also referred to as:

• Vitreous detachment (common term)
• PVD (medical abbreviation)
• Posterior hyaloid detachment

Vitreous detachment, which is very common and usually benign, should not be confused with retinal detachment, which is an emergency. This crucial distinction is covered in a dedicated section below.

CAUSES

Why does the vitreous detach?

Vitreous detachment is above all a consequence of the natural ageing of the eye. The gradual liquefaction of the gel reduces its adhesion to the retina, until the posterior hyaloid eventually detaches. It is an expected phenomenon, not a disease in itself.

Age, the main factor

PVD most often occurs after the age of 50 to 60. It becomes very common beyond the age of 65. Its prevalence rises steadily with age, so much so that a large majority of older people present, at some point, with a posterior vitreous detachment in at least one eye. It is therefore a commonplace event of ocular ageing.

High myopia

In a highly myopic person, the eye is longer than normal and the vitreous undergoes earlier liquefaction. Vitreous detachment may then occur sooner, sometimes as early as the age of 40 to 45. High myopia also increases the risk of an associated retinal tear: monitoring is therefore particularly important in these cases.

Other contributing circumstances

Other situations accelerate or trigger vitreous detachment:

• Recent cataract surgery
• Ocular trauma or a blow to the eye
• Intraocular inflammation (uveitis)
• A history of vitreous detachment in the other eye: the second eye often follows a few months or years later
• Diabetes and diabetic retinopathy, which alter vitreoretinal adhesions (see our page on diabetes and the retina)

SYMPTOMS

What are the symptoms of vitreous detachment?

Vitreous detachment typically presents as the sudden appearance of two visual symptoms: floaters and, sometimes, flashes of light. They generally affect a single eye and often develop over a few hours or days. Their recent appearance should prompt a fundus examination.

Floaters (“floating spots”)

This is the most common symptom. Patients describe black spots, filaments, cobwebs or “floating spots” that move across the field of vision and follow the movements of the eye. These shadows are cast onto the retina by the condensations of the detached vitreous. They are particularly visible against a bright background: a white wall, the sky, a screen.

A denser floater, ring- or circle-shaped, sometimes corresponds to the Weiss ring: this is the point where the vitreous was attached around the optic nerve. Its presence is a fairly characteristic sign of an established vitreous detachment.

Flashes of light (photopsias)

Some patients perceive flashes or bursts of light, known as photopsias, mainly at the periphery of the visual field and often more marked in the dark. They reflect a traction of the vitreous on the retina as it detaches: the retina, mechanically stimulated, sends a sensation of light to the brain.

These photopsias generally last a fraction of a second and recur, particularly with eye movements. Their presence is not trivial: it signals active traction and warrants a careful examination of the peripheral retina, since it is in these areas that a tear may occur.

A recent symptom = a prompt examination — the sudden appearance of floaters or flashes of light, even though vitreous detachment is usually benign, warrants an ophthalmological consultation with a dilated fundus examination within a short timeframe, in order to confirm the absence of a retinal tear.

WARNING SIGNS

Vitreous detachment or retinal detachment: how to tell them apart?

This is the essential question. Vitreous detachment is benign in the vast majority of cases, but the traction it exerts can, more rarely, cause a retinal tear. This tear can in turn progress to a retinal detachment, which is a sight-threatening emergency. Certain signs should raise the alarm.

The signs that call for urgent consultation

Seek care without delay, as an emergency, if you notice any of the following signs:

• A sudden shower of floaters: dozens or hundreds of black spots appearing abruptly, like a “shower of soot”
• A rapid multiplication of flashes of light
• A veil, curtain or black shadow encroaching on part of the field of vision, often on one side
• A loss of the peripheral visual field, like a sector disappearing
• A sudden drop in vision

Warning signs to remember — a shower of floaters, a dark veil or curtain rising or falling within the field of vision, a fixed peripheral shadow: these symptoms may reflect a tear or the onset of a retinal detachment. They call for an emergency ophthalmological examination, without waiting for the scheduled appointment.

Why this distinction is vital

A simple vitreous detachment does not directly threaten vision. An untreated retinal tear, however, can allow fluid to pass under the retina and cause a retinal detachment. Caught in time, a tear is treated with laser during a consultation. Left neglected, a retinal detachment may require surgery and compromise visual recovery.

In other words, vitreous detachment is not dangerous in itself, but it is the moment when a possible tear may appear. That is why it should never be regarded as “unimportant”: only a fundus examination can distinguish the benign form from the at-risk form.

DIAGNOSIS

How is the diagnosis made?

The diagnosis of vitreous detachment rests on the fundus examination after pupil dilation. This painless examination allows the ophthalmologist to analyse the vitreous and, above all, to inspect the whole retina, including its periphery, in search of a possible tear. It is the key examination.

The dilated fundus examination

Dilating drops are instilled to enlarge the pupil. After about twenty minutes, the ophthalmologist examines the retina using a lens and a light. They look for the Weiss ring, assess the state of the vitreous and, crucially, scan the peripheral retina to detect any tear or at-risk lesion. Dilation blurs vision and causes glare for a few hours: it is best not to drive straight afterwards.

OCT and ultrasound

Optical coherence tomography (OCT) produces a high-resolution cross-section of the retina and the vitreoretinal interface. It confirms the detachment of the posterior hyaloid, checks for residual traction on the macula and detects complications such as a macular hole. When the vitreous is cloudy and obstructs the view of the fundus, an ocular ultrasound can supplement the assessment.

At my practice in Paris 13, I carry out the dilated fundus examination and OCT on site. This makes it possible to confirm the vitreous detachment, check the peripheral retina and arrange appropriate monitoring, or prompt management in the event of a tear.

COURSE

Does a vitreous detachment need treating?

In the vast majority of cases, a vitreous detachment requires no treatment. The vitreous finishes detaching over a few weeks, the floaters often ease with time, and vision remains stable. Monitoring is sufficient. Treatment is only considered if a complication is detected on examination.

Monitoring, in most cases

When the fundus is normal, with no tear, the usual approach is simple monitoring:

• A follow-up fundus examination a few weeks later, to confirm the absence of a secondary tear
• An immediate consultation if a new symptom appears (shower of floaters, veil, shadow)
• A gradual adaptation: the brain often learns to “ignore” the residual floaters

When a tear is present

If the examination reveals a retinal tear, treatment is offered to prevent progression to a retinal detachment. Most often, this involves a laser carried out during a consultation, which “welds” the retina around the tear. When a retinal detachment has already developed, specialised surgical management becomes necessary, on an emergency basis.

And troublesome floaters?

Most floaters become less noticeable over the months. When they remain very disabling after a long period, options exist, but they apply to particular situations and are discussed on a case-by-case basis, after ruling out any retinal pathology. There is no justified intervention for moderate, well-tolerated floaters.

FAQ

Frequently asked questions

Sources

1. Société Française d’Ophtalmologie (SFO). Suivi d’un patient présentant les signes d’un décollement postérieur du vitré. Fiche de conduite à tenir validée par le CFSR, la FFM et la SFR. sfo-online.fr
2. American Academy of Ophthalmology (AAO). Posterior Vitreous Detachment, Retinal Breaks, and Lattice Degeneration Preferred Practice Pattern®. 2024. aao.org/education/preferred-practice-pattern
3. Johnson MW. Posterior vitreous detachment: evolution and complications of its early stages. Am J Ophthalmol. 2010;149(3):371-382. PMID 20172065
4. Akiba J. Prevalence of posterior vitreous detachment in high myopia. Ophthalmology. 1993;100(9):1384-1388. PMID 8371928

Further reading

• Floaters: should you worry about these floating spots?
• Retinal detachment: recognising the emergency and acting fast
• Vitrectomy: indications, procedure and aftercare
• Booking an appointment at the practice

Cachan practice · Tel. +33 1 45 47 08 11
Paris 13 practice · Tel. +33 1 89 31 30 60

Medical disclaimer

This article is for information purposes. A personalised ophthalmological opinion remains essential for any therapeutic decision.

This article is intended as general information and is not a substitute for a medical consultation. Diagnosing a vitreous detachment and searching for a possible retinal tear require a full ophthalmological examination with a dilated fundus. Faced with the sudden appearance of floaters, flashes of light, a veil or a shadow in the field of vision, seek an ophthalmologist promptly.

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