What are the Causes of Posterior Vitreous Detachment (PVD)?

As you get older the various structures that make up your eye change; this includes the vitreous gel. The vitreous is made up mainly of water and collagen and it has a stiff, jelly-like consistency. As you age the vitreous becomes more watery, less jelly-like and isn't able to keep its usual shape. As a result, it begins to move away from the retina at the back of the eye towards the centre of the eye.
 
Although it can cause some frustrating symptoms, it does not cause pain, harm the eye, or change the way the eye works. In the vast majority of cases, PVD will not lead to long term changes in your vision.
 
When we look at something, light passes through the front of the eye, and is focused by the lens onto the retina. The retina is a delicate tissue coating the inside of the eye. It converts the light into electrical signals that travel along the optic nerve to the brain. The brain interprets these signals to 'see' the world around us.  The eye is filled with a clear jelly-like substance called the vitreous gel. Light passes through the vitreous gel to focus on the retina. When the vitreous jelly comes away from the retina this is called a vitreous detachment.
 

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