What is Posterior Vitreous Detachment?

Posterior Vitreous Detachment (PVD) is a common condition which occurs in majority of people over the age of 65. As people get older, the vitreous, a jelly-like substance inside the eye changes. The vitreous is attached to the retina, more strongly in some places than others. When a PVD starts the jelly comes away from the retina. The central part of the vitreous becomes more liquid and the outer part (cortex) peels away from the retina. As it comes away from the retina it can cause the symptoms of posterior vitreous detachment.

What are the symptoms of PVD?

Many people are not aware that they have developed PVD but some notice symptoms such as floaters or flashing lights. Floaters can take many forms from little dots, circles, lines, to clouds or cobwebs. Sometimes people experience one large floater which can be distracting and make things a difficult to read.

The flashing lights that occur are also caused by the PVD. As the outer part of the vitreous detaches from the retina it can pull on this light sensitive membrane, especially where the vitreous is attached quite strongly to the retina. The pull of the vitreous in these areas stimulates the retina. This stimulation causes the sensation of flashing lights since the brain interprets all stimulation signals from the retina as light.

Can anything be done to help with the PVD?

Unfortunately at the moment nothing can be done medically for this condition, usually people find that the symptoms calm down after about six months and people do eventually get used to living with the floaters. The brain tends to adapt to the floaters and eventually is able to ignore them.

Will I lose any Sight?

Posterior vitreous detachment does not in itself cause any permanent loss of vision. Your visual acuity should remain the same that is you will be able to see just as you could before the posterior vitreous detachment started. You may have some difficulties to begin with because of the floaters and flashing lights though these do not cause permanent sight loss.

What are the Complications of PVD?

The only threat to vision is the small chance of a retinal tear leading to a retinal detachment. It is important to stress that retinal tears and detachments are much rarer conditions and that very few people with PVD go on to develop either of these problems.

Are Retinal Tears Serious?

Sometimes the vitreous is so firmly attached to the surface of the retina that as the jelly collapses it (LINK).

Warning signs of a retinal tear or detachment could be an increase in size and number of your floaters, a change or increase in the flashing lights you experience or a blurring of vision. If you experience any of these symptoms you should seek medical advice within 24 hours. This is particularly important if you notice a dark curtain falling across your vision, as this may mean that the retina has already partially detached. Early intervention may allow treatment of a tear before it becomes a detachment and increase the chances of a good recovery from a retinal detachment which has already occurred.

Will I need to keep seeing my doctor?

Your eye specialist will give you a thorough examination during your first visit. They will pay special attention to whether or not the retina is in any danger. If it isn't then they may not need to see you again. However if you begin to experience the symptoms warning of a possible retinal detachment, such as increased or definite change in floaters more severe flashing lights and/or a 'curtain' falling over your vision then a trip to the doctor is again necessary.