综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

您現(xiàn)在的位置: Language Tips> Audio & Video> Special Speed News  
 





 
When eye problems involve diseases of retina
[ 2007-07-30 09:38 ]

        

        Download

 

This is the VOA Special English Health Report.

Theretinais the sensory tissue in the back part of the eye. It gathers light and captures images from the lens, much like film in a camera. The retina processes these images into signals that travel through the optic nerve to the brain.

Diseases of the retina can cause vision loss over time.

A thirty-year-old listener in Vietnam says he cannot see well and doctors have told him he has retinal degeneration. This is the loss or destruction of the sensory tissue of the retina. Trinh Phuong Bac says he first developed problems in his right eye when he was a child. He would like to know more about this disease.

Doctor Emily Chew is a deputy division director at the National Eye Institute, one of the National Institutes of Health in the United States. She says it is true what doctors have told our listener: there is no cure for retinal degeneration.

She says most cases are considered genetic. Scientists have been trying to develop gene treatments for it, and in recent years there have been some reports of possible progress. But Doctor Chew says these studies of experimental gene therapies have so far only involved animals.

Recently, the National Eye Institute reported the findings of a study of diet and a disease called retinopathy. It says the omega-three fatty acids EPA and DHA, both found in fish, protected mice against the development and progression of retinopathy. The study showed that decreasing omega-six fatty acids in the diet also helped. The study was published this month in Nature Medicine.

The findings could be useful to research into retinopathy in humans, including a common cause of vision loss in diabetics. A separate form can lead to permanent blindness in babies born too early. Doctor Chew, however, says this study may have no connection to treating retinal degeneration.

She also says there is disagreement about whether taking high levels of vitamin A could reduce the severity of the disease. She says there was a study which suggested that vitamin A helped some people with retinitis pigmentosa. But she notes that other investigators have disputed these findings.

Retinitis pigmentosa, or R.P, is a form of retinal degeneration. R.P. is the name for a group of diseases that can be found as early as when a person is a teenager. People with R.P. have genes that give incorrect orders to cells that receive light. As a result, the retina can begin to self-destruct.

And that's the VOA Special English Health Report, written by Caty Weaver. I'm Mario Ritter.


retina : 視網(wǎng)膜

點擊進入更多VOA慢速

(來源:VOA  英語點津姍姍編輯)

 
 
相關(guān)文章 Related Stories
 
         
 
 
 
 
 
         

 

 

 
 

48小時內(nèi)最熱門

   

本頻道最新推薦

     
  《追夢女郎》(精講之六)
  World trade talks break down
  New British leader shapes first post-Blair cabinet
  England goes smoke-free in public buildings July 1
  School ends, and so does our foreign student series

論壇熱貼

     
  請問“老鄉(xiāng)”這個詞怎么翻譯?
  C-E: how to say "路盲"?
  請問“老鄉(xiāng)”這個詞怎么翻譯?
  C-E: how to say "路盲"?
  各位,“相親”英語怎么說?
  指紋上的ridges and loops是什么意思?






阳原县| 广饶县| 南召县| 绥化市| 高清| 江北区| 高安市| 巴楚县| 哈巴河县| 晴隆县| 靖西县| 北京市| 永宁县| 六枝特区| 周口市| 龙井市| 准格尔旗| 卓资县| 南宫市| 孙吴县| 靖西县| 广水市| 拜泉县| 庆阳市| 辽源市| 图木舒克市| 石阡县| 本溪市| 重庆市| 平潭县| 沁阳市| 凤凰县| 平果县| 宁国市| 容城县| 神农架林区| 大厂| 罗源县| 合川市| 武定县| 罗甸县|