日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

您現在的位置: 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 : 視網膜

點擊進入更多VOA慢速

(來源:VOA  英語點津姍姍編輯)

 
 
相關文章 Related Stories
 
         
 
 
 
 
 
         

 

 

 
 

48小時內最熱門

   

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”這個詞怎么翻譯?
  C-E: how to say "路盲"?
  請問“老鄉”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?






主站蜘蛛池模板: 国产成人一区二区在线观看 | heyzo加勒比jav素人 | 欧洲黄色网址 | 69xxx国产| 久久亚洲精品国产 | 久久综合精品视频 | 欧美性高潮视频 | 久久久成人网 | 激情视频在线观看免费 | 国产一区二区免费视频 | 成年人黄色免费视频 | 久久精品国产精品亚洲精品色 | 最新日本中文字幕 | 欧美精品一区三区 | 亚洲做受高潮无遮挡 | 国产9区 | 国产精品久久精品 | 亚洲99 | 岛国精品在线 | 国产日韩在线播放 | av大片在线观看 | 国产女人18水真多毛片18精品 | 日本黄色动态图 | 亚洲成人伦理 | av青青| 鸥美一级片| 大学生一级一片第一次 | 91精品久久香蕉国产线看观看 | 国产99久久久 | 亚洲天堂免费观看 | 粉嫩视频在线观看 | 在线香蕉视频 | 亚洲三级视频在线观看 | 国产日本一区二区 | 欧美国产一区二区 | 有码一区二区三区 | 黄色一级网站 | 草草视频在线 | www亚洲 | 麻豆精品在线视频 | 毛片毛片毛片 |