Why do they happen?
What kind of vision problems do people have?
- Your visual field is everything you can see – from straight ahead to everything around it and to the sides. Central vision loss is when the centre of your visual field is affected. It may mean that you can’t see anything at all, or that you can only see things on the edge of where you are looking, not in the centre.
- Visual field loss is when other parts of your visual field are affected. Some people find that they lose one side of their visual field, so they can only see the right or left half of what they are looking at. This is called hemianopia and is a common visual problem after stroke.
- Sometimes a stroke can affect the way you control your eyes, causing eye movement problems. This may make moving from looking at one thing to another difficult or affect the way you judge distances between objects. It can also mean that your eye is constantly moving, so that objects seem to wobble. This is called nystagmus.
- A stroke can also affect the way your brain processes the information it receives from your eyes. This can cause a number of visual processing problems. The most common of these problems is visual neglect. It happens when your brain does not receive information about what you are seeing on one side. So you may not be aware of anything on either your right or left side. This means that you may accidentally ignore people, or you may bump into things, because you don’t realise that they are there.