ࡱ> #` ,bjbjmm 6G(#/>RRRfjjj8,4fw:HHHfff7777A8W2w}yh{2wR""D"2wHHGw"""HRH7"7""56R7H 0Sݞju67]w0w6s|s|,7s|R7Df>,"$fff2w2w"jfffwfffjfffjfff   What we see is made in the brain from signals given to it by the eyes. What we see is in fact made in the brain. The brain makes sight from signals given to it by the eyes. What is the normal structure of the eye? The eye is made of three parts. A light focussing bit at the front (cornea and lens). A light sensitive film at the back of the eye (retina). A large collection of communication wires to the brain (optic nerve). A curved window called the cornea first focuses the light. The light then passes through a hole called the pupil. A circle of muscle called the iris surrounds the pupil. The iris is the coloured part of the eye. The light is then focused onto the back of the eye by a lens. Tiny light sensitive patches (photoreceptors) cover the back of the eye. These photoreceptors collect information about the visual world. The covering of photoreceptors at the back of the eye forms a thin film known as the retina. The retina lies on a layer of nerves and blood vessels. This layer is called the choroid. The retina needs a healthy choroid to work. Each photoreceptor sends its signals down very fine wires to the brain. The wires joining each eye to the brain are called the optic nerves. The information then travels to many different special vision parts of the brain. All parts of the brain and eye need to be present and working for us to see normally. What is Chorioretinal Atrophy? Atrophy is the medical word for when a bit of the body withers away and stops working. Chorioretinal is one big word often used to describe the choroid and retina together. Chorioretinal Atrophy is a condition of the eye where both the choroid and retina are damaged. This causes them to wither away and stop working. What are the causes of Chorioretinal Atrophy? There are many different causes of Chorioretinal Atrophy. Infection is the most common cause of Chorioretinal Atrophy The most common reason for the choroid and retina to become damaged is by an infection. There are many different kinds of germs that can cause infection. They all have complicated names and include: Toxoplasmosis Toxocara Cytomegalovirus Cold Sore Virus Chicken Pox Virus These germs usually only damage the eye if they cause an infection in an unborn baby. This means that the baby may be born with visual impairment. Sometimes as well as causing Chorioretinal Atrophy the germs may cause damage to other parts of the eye. This may lead to other eye conditions such as cataract, iritis or glaucoma. The infection may also affect other parts of the body. This may lead to the child developing epilepsy, reduced hearing or learning difficulties. Myopia (Short-sight) sometimes leads to Chorioretinal Atrophy Myopia is also known as short-sight. This means that a child who is short-sighted can see better at short distance than long. These children generally have larger eyes than usual. Some children with myopia can develop Chorioretinal atrophy when they are older. Inflammation may also damage the choroid and retina Sometimes children can develop inflammation of the choroid and retina. The inflammation may be caused by the childs own immune system. The immune system usually helps to fight infections. Very rarely it may attack bits of a childs own body. These children may also have an inflammatory condition of their blood vessels (vasculitis) or joints (arthritis). itis means to be inflammed. itis is often added to end of the name of a part of the body to describe an inflammatory condition of that part. The posterior uvea is another medical name for the choroid. When the choroid is inflammed it is often called posterior uveitis. Posterior uveitis is a cause of Chorioretinal Atrophy. Often no cause can be identified Often it cannot be said for sure why the choroid and retina becomes damaged. Doctors call this Idiopathic Chorioretinal Atrophy. How does Chorioretinal Atrophy affect the way a child sees? Most young children will feel their vision to be normal as they have never known anything else but their own visual world. At first they assume that everyone else has vision the same as their own. They do not realise that other people see things differently. Chorioretinal Atrophy may affect any part of the back of the eye. Some conditions such as toxoplasma tend to cause scarring of the central bit. If this happens then the central part of the vision will also be missing. This causes reduced vision. The child will not usually notice if a part of the retina away from the centre is scarred. Toxoplasma can affect one or both eyes. If the central bit of the retina and choroid in both eyes is damaged then the child will notice blurred vision. The vision around the sides will still be OK. This vision is useful for getting around and not bumping into things. The child will however have difficulty reading and recognising faces. Sometimes fast to and fro movements of the eyes occur. This is called Nystagmus. Squint may also develop. How is the diagnosis made? An eye doctor can recognise the typical pattern of damage at the back of the eye. Sometimes blood tests and scans of the eyes and brain may also help. What can be done to help the eyes? Once Chorioretinal Atrophy has developed it does not get better. The retina cannot grow back and fix itself. Usually the damage does not get any worse. Sometimes germs like toxoplasma can stay asleep in the retina for many years and wake up at any time. If it wakes up a new infection can start. Blurred vision and floaters are common symptoms of a new infection. It is important to treat any infection quickly to prevent further damage to the retina. Antibiotics and steroid tablets are often used. If treated quickly the blurred vision and floaters usually settle within a few weeks. In some cases the jelly in the eye (vitreous) can become inflammed. This can cause annoying floaters that get in the way of vision. In most children the floaters gradually go away with treatment. Vision can be improved with the use of Low Vision Aids and increasing the size of print. How can parents, family, friends and teachers make a difference? There are lots of things that can be done to help children with chorio-retinal atrophy make the most of their vision. We use our vision to get around, learn new things and to meet other people and make friends. It is important to consider what your childs particular problems with vision might be now and in the future. If your child has been prescribed spectacles, contact lenses or a Low Visual Aid (LVA) it is important that they are encouraged to wear and use them. This will help your child see more clearly and ensure the vision parts of the brain grow and develop. Wearing a hat and tinted glasses can also help reduce symptoms of photophobia ( light sensitivity ). If your child has also been prescribed drops they should be used regularly as advised by the nurses and doctors at the eye clinic. Problems at school may be due to some of the reading books being hard to see. This often means it takes longer and more effort to do the work. If the size of print is increased and letters and words spaced more widely most children will find schoolwork easier. Good bright lighting and crisp black print on a clean white background will also make things easier. Sometimes placing reading books on a slope, which tilts the print towards the child, will improve reading speed as well. Placing a piece of blue tack below the line they are reading, at the beginning of the next sentence, can help some children find their way back to the start of the next line more quickly. It is also worth watching carefully to find out what the smallest toys are that a child can see and play with. Then try to only play with toys that are the same size or bigger. Placing one toy on a plain background will often help children see it more readily. Placing lots of toys of different size and colour close together on a patterned background can make them difficult to see for many children with impaired vision. Recognising facial expressions can often be difficult. It is worth trying to find out at what distance facial expressions can be seen and responded to. Then always try to talk and smile from within this distance. This helps a child to learn what facial expressions mean and to copy them. Infants and young children need to learn about the world around them. Visual impairment teachers, physiotherapists and occupational and speech therapists may all add to the childs care and education. It is important to continue the programmes that they recommend. If the child is involved in family activities vision can improve and new skills can develop. Even if a child has very poor vision many useful and practical things can be done to improve the ability of the child to get around, interact with other children and learn. Advice can be given on ways to support your child by your VI teacher or habilitation specialist.     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