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Age Related Macular Degeneration - The Leading Cause Of Blindness PDF Print E-mail
Wednesday, 18 November 2009 14:31
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Age-related macular degeneration (AMD) is the leading cause of blindness. It is just one form of macular disease, which affects the eye's retina. An estimated 500,000 people in the UK suffer from AMD, 40% of these are over the age of 75. Also it is the leading cause of blindness in developed countries like USA, Canada and Australia. It was thought that the incidence of this disease is very low in a developing country like India, a decade earlier. But this scenario is no more true now, as we are seeing more and more cases of AMD.

What is AMD?

AMD is the most common form of macular disease, which affects the central part of the retina. It is an age-related process and usually develops after a person reaches 50 years. It generally involves both eyes, although they may not be affected at the same time or to the same degree. Some 90% of these cases are dry AMD which cannot be treated but 10% are wet ADM. Dry AMD means visual cells simply stop to function. Wet AMD is by far the most aggressive form of the disease. The condition is caused by the growth of new blood vessels under the centre of the retina. These can leak fluid, causing scar tissue to form and destroying central vision in a period of between two months and three years. Peripheral vision is retained. The condition causes problems reading, seeing small objects and distorted vision.

What are the symptoms?

In the early stages of AMD, central vision may be blurred or distorted. Objects may take an unusual size or shape. This process can happen quickly or develop over several months. People with the condition may become very sensitive to light or actually see lights that are not there.
There may be some discomfort, although overall the condition is not painful.

How is AMD treated?

Variety of medical treatment is tried over several years, like prescribing high doses of B-complex tablets, Anti-oxidants etc. But the results are not good. But in recent years, PDT is tried in developed countries and has given fairly good results.

Photo dynamic therapy (PDT) is the first effective treatment for correcting wet AMD. It is a relatively new treatment and was first used in the UK in 1999 by doctors at the Royal Liverpool University hospital. PDT is thought to be suitable for around a third of patients with wet AMD since it is effective only if the condition is caught early. It involves injecting a light sensitive dye called Visudyne into the body, which sticks to the lining of abnormal blood vessels within the retina. The process takes half an hour. A light is then shone into the area through a contact lens, activating the dye and causing it to damage the abnormal blood vessels.

The treatment may need to be repeated every three months and it is fairly costly.

Side effects include lower back pain, a reaction to light and a temporary loss of vision in around 3% of cases.

 
Blindness - What to Know to Guide You on What to Do PDF Print E-mail
Written by Roger Guzman   
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Blindness cases have gone up in Minnesota. As diabetes risk goes up so does this complication. The Department of Health in Minnesota released the statistics that the main cause of blindness is diabetes. Around 500 to 800 become blind each year due to the complications of this condition.

The most common eye disease that is related to diabetes is retinopathy but this should not be the case. Why? Because MOA or the Minnesota Optometric Association says that early treatment of this condition decreases the severe vision loss by 50-60%. This is the best time to raise the awareness of this condition as there have been anecdotal records on how people deal with this problem.

For example, a 57-year old lawyer in Toronto barely has any vision and relies on specialized equipment to help him in his work and dealings with his family. His assistant used to print out the documents in extra large print but now the lawyer has other technology that helps him.

One thing he uses is a desktop closed circuit television which has a video camera and a computer monitor. He puts the document on the tray below the camera. The magnified image is beamed up to a screen. The words are one inch high.

This lawyer is lucky in a way because he was referred to a low-vision rehabilitation clinic where he was able to get advanced visual aids that lessened the burden of his disability. LVR helps patients through the use of personalized devices and training so they can use whatever remaining vision they have as best as they can.

Low visual rehabilitation is for people who are no longer helped by standard therapies like strong reading classes. By this time also, they are told by their eye care specialists that they can no longer help. LVR will not bring back the lost vision but it means that people could keep their job longer and maintain their independence.

As in the case of the lawyer, he was prescribed two devices after a detailed assessment. He was able to use a two-inch long telescope that attaches to his glasses and a pair of prismatic lenses. The lawyer wears the telescope in a string around his neck. He uses this when he needs to see anything afar.

The president of the MOA Board of Trustees, Dr. Tina McCarty, who is also an optometrist at Eye Care Center said that diabetes can be managed properly via an integrated health program. This should advocate a yearly complete eye exam. People should know that diabetes can cause vision loss and will need regular exams.

About 60% of type 1 diabetics will have signs of retinopathy after ten years. After fifteen years, nearly all type 1 diabetics will have retinopathy. The trouble is that patient may not notice the signs. This is a problem because early discovery and treatment is important to prevent blindness.

Changes in the retina's blood vessels may lead to diabetic neuropathy. In this case, the blood vessels may swell and fluid will leak. In other cases abnormal blood vessels may grow right on the retina's surface. Blindness could be the result of these changes. What can we do to avoid this?

Get an eye exam every year so it will be caught early. Once the diabetic retinopathy is here, take the medication as the doctor ordered. Keep eating a healthy diet and stay on a regular exercise program. Also control the high blood pressure and high blood sugar. And last but not least, avoid smoking and drinking alcohol.

Here are the signs of retinopathy. See the eye doctor if you have any of these symptoms:

  • Blurry vision
  • Both or one eye hurts
  • Feeling pressure in the eye
  • Seeing double, spots or floaters
  • Having trouble reading
  • Can't see things at the sides as well as before

There you have a background information on retinopathy. You have the knowledge on what to do in order to avoid this dreadful complication. There are also advanced visual aids that could help you keep your job longer and maintain your independence. It is not the end of the word when faced with the possibility of blindness.

 


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