Vitreous Degeneration

What vitreous degeneration is

The vitreous is a clear, jelly-like substance that fills about 80% of the eye's volume, between the lens at the front and the retina at the back. In young people it is a firm, uniform gel of water held in a mesh of collagen fibers and hyaluronic acid. It is firmly stuck to the retina, especially around the edges and over the optic nerve.

With age, two linked changes happen:

1. Liquefaction (syneresis): pockets of liquid form inside the gel as the collagen framework breaks down. The collagen fibers clump together into strands and knots that cast shadows on the retina. You see these as floaters.
2. Detachment: as the gel shrinks and becomes more liquid, it pulls away from the back of the eye. This is a posterior vitreous detachment (PVD), the end stage of vitreous degeneration.

Eye doctors often write "vitreous degeneration" or "vitreous syneresis" on a report when they see these changes. It describes normal aging of the gel and is not the same as macular degeneration, which affects the retina itself.

Symptoms of vitreous degeneration

Many people have vitreous degeneration with no symptoms. When symptoms appear, they include:

• Floaters: small dots, threads, rings, squiggles or cobwebs that drift across your vision and keep moving after your eye stops. They are easiest to see against a bright sky, a white wall or a computer screen.
• A ring floater (Weiss ring): a large circle or partial circle near the center of vision. It forms where the gel detaches from around the optic nerve and is a sign that a PVD has happened.
• Flashes of light: brief arcs or streaks of light, usually at the side of your vision, most noticeable in the dark. They happen when the shrinking gel tugs on the retina, which responds by sending a light signal.
• Hazy or cobweb-like vision: a mild blur that clears as you move your eye.

Symptoms are usually in one eye at a time. The second eye commonly goes through the same change within a few years.

Causes and risk factors

Age

Aging is the main cause. Liquefaction begins in childhood and progresses slowly. By age 50 or so, about half the vitreous may be liquid. PVD most often happens between ages 50 and 75 and is found in most people over 80.

Nearsightedness (myopia)

A nearsighted eye is longer than average, so the vitreous is stretched and degenerates earlier. People with moderate to high myopia often notice floaters in their 30s or 40s and have a higher risk of retinal tears.

Other causes of earlier vitreous degeneration

• Cataract surgery or other eye surgery
• Eye injury, including a blow to the eye or head
• Inflammation inside the eye (uveitis)
• Diabetic eye disease
• Inherited connective tissue disorders such as Stickler syndrome and Marfan syndrome
• Menopause, which some studies link to earlier PVD in women

Vitreous degeneration, PVD and retinal tears

Most vitreous detachments separate cleanly. In about 1 in 10 people with sudden symptoms of PVD, the gel pulls hard enough at a point of strong attachment to rip the retina. A retinal tear can let fluid seep under the retina and lift it off, which is a retinal detachment. Detachment can cause permanent vision loss if it is not repaired quickly.

A tear can also tear a small blood vessel, causing a vitreous hemorrhage, which looks like a red haze, dark specks or sudden blurred vision.

The highest risk of a tear is in the first 6 weeks after symptoms start. That is why eye doctors ask you to come back promptly if symptoms change during that time.

How vitreous degeneration is diagnosed

Your eye doctor will ask when the floaters or flashes started, whether they came on suddenly, whether you have noticed a shadow, and about nearsightedness, surgery or injury. Then they will:

• check your vision and eye pressure
• put in drops to widen (dilate) the pupils, which takes 20 to 30 minutes and blurs vision for a few hours, so plan not to drive
• examine the vitreous and the entire retina with a slit lamp and a bright headlamp, sometimes pressing gently on the eyelid to see the far edges of the retina
• sometimes use optical coherence tomography (OCT) to show whether the gel has separated from the center of the retina
• use ultrasound if blood or a cloudy lens blocks the view

If no tear is found, you may be asked to return in 4 to 6 weeks, or sooner if symptoms change.

Treatment

Usually no treatment is needed

Vitreous degeneration itself does not need treatment. Floaters usually become less noticeable over weeks to months as they sink below your line of sight and as your brain learns to ignore them. Flashes generally stop once the gel has fully separated.

Treatment for persistent, disabling floaters

A small number of people have dense floaters that interfere with reading or driving for many months. Options include:

• Vitrectomy: surgery to remove the vitreous gel and replace it with a saline solution. It removes floaters effectively but carries risks including cataract, retinal tear or detachment, and infection. It is reserved for severe cases.
• YAG laser vitreolysis: a laser breaks up certain large floaters such as a Weiss ring. Evidence is limited, and it suits only some floaters.

There are no eye drops, supplements or diets proven to reverse vitreous degeneration or dissolve floaters.

Treatment of a retinal tear

A tear found early is sealed with laser or freezing treatment (cryotherapy) in the clinic. This creates scar tissue around the tear to stop fluid getting under the retina. A retinal detachment needs surgery.

Living with vitreous degeneration

Can you live a normal life with vitreous degeneration?

Yes. Vitreous degeneration does not cause blindness by itself, does not damage the retina, and does not stop you from working, driving, reading or playing sports once any tear has been ruled out. Most people find floaters fade into the background within a few months.

Practical tips:

• Move your eyes up and down to swirl a floater out of your line of sight.
• Use good lighting and reduce screen brightness or use dark mode if floaters are distracting against white backgrounds.
• Wear sunglasses outdoors to reduce contrast from bright sky.
• Protective eyewear for contact sports and racquet sports protects against eye injury, especially if you are very nearsighted.

Sports and exercise

There is no proven need to stop exercise or lifting. Some eye doctors advise avoiding very high-impact or head-jarring activities, such as bungee jumping or heading balls repeatedly, for the first few weeks after a new PVD, until a follow-up exam confirms no tear. Ask your eye doctor about your own situation.

Know the warning signs

Learn the symptoms of a retinal tear and act quickly if they appear: a sudden increase in floaters, new or frequent flashes, or a shadow over part of your vision. The second eye is at risk of the same process.

Frequently asked questions

What causes vitreous degeneration?

Aging is the main cause. The collagen and hyaluronic acid that keep the vitreous gel firm gradually break down, so it liquefies and clumps. Nearsightedness, cataract surgery, eye injury, inflammation and diabetes can make it happen earlier.

Is vitreous degeneration serious?

Usually not. It is a normal aging change. The main risk is that, as the gel separates, it can tear the retina in a small number of people. That is why any new floaters or flashes need a dilated eye exam promptly.

Can you live a normal life with vitreous degeneration?

Yes. Once your eye doctor has checked for a retinal tear, you can work, drive, read and play sports normally. Floaters usually become much less noticeable over a few months. Watch for warning signs such as a sudden shower of floaters or a shadow in your vision.

Is vitreous degeneration the same as macular degeneration?

No. Vitreous degeneration affects the clear gel inside the eye and causes floaters. Macular degeneration affects the macula, the center of the retina, and causes loss of central vision. They are unrelated conditions, although both become more common with age.

Can vitreous degeneration be reversed?

No. The changes in the gel are permanent, and no drops, vitamins or diets reverse them. Floaters usually become less bothersome over time. For rare, severe cases that disrupt daily life, surgery (vitrectomy) or laser can remove or break up floaters.

How long do flashes last with vitreous degeneration?

Flashes usually settle within a few weeks to a few months, once the gel has fully separated from the retina. Flashes that become more frequent, or come with new floaters or a shadow, need a same-day eye exam.