Post new topic Reply to topic  [ 1 post ] 
  Print view

Retinal implant gives sight to blind patients
Author Message
PostPosted: Thu Nov 04, 2010 10:06 am 

Joined: Tue Mar 10, 2009 1:21 pm
Posts: 1457
Location: Hampshire
Three blind patients can now see shapes and objects for the first time thanks to a ground-breaking retinal implant - offering hope to many people with sight problems.

Each of the patients, who lost their sight to an inherited disease, had only limited ability to perceive bright light prior to the surgery.

But within days of undergoing surgery, all three could locate objects placed on a table, including a cup, a saucer and different geometric shapes.

One patient was able to walk around a room with confidence, tell the time from a clock face, distinguish between shades of grey and even read his own name.

Patients in the UK are due to receive the implant for the first time in a follow-up trial starting next year.

Two men and one woman aged 40, 44 and 38 took part in the pilot study testing the device developed by Retina Implant AG, a medical technology company based in Reutlingen, Germany.

All had the inherited condition retinitis pigmentosa, which gradually destroys the light-sensitive retina at the back of the eye eventually leading to blindness.

After first becoming affected in early childhood, each of the patients had lost the ability to read at least five years before undergoing surgery.

The implant is fitted beneath the retina and consists of a three millimetre-square array of 1,500 light sensors.

Each 'photodiode' delivers a pulsed electrical signal to adjoining groups of nerve cells, sending a message to the brain. A power supply unit is connected to the device by means of a cable passed through the skin.


Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: