About Careers MedBlog Contact us

Long-term Blindness Much More Blinding

by Himabindu Venkatakrishnan on January 19, 2015 at 2:35 PM
Font : A-A+

 Long-term Blindness Much More Blinding

Surgery to restore eyesight cannot entirely undo the brain rewiring caused by long term blindness, reveals a new study.

Recent scientific advances have meant that eyesight can be partially restored to those who previously would have been blind for life.


However, scientists at the University of Montreal and the University of Trento have discovered that the rewiring of the senses that occurs in the brains of the long-term blind means that visual restoration may never be complete.

Scientists know that in cases of untreatable blindness, the occipital cortex that is the posterior part of the brain that is normally devoted to vision becomes responsive to sound and touch in order to compensate for the loss of vision.

Giulia Dormal said that on one hand, the findings revealed that the visual cortex maintains a certain degree of plasticity that is the capacity to change as a function of experience, in an adult person with low vision since early life.

On the other, they discovered that several months after the surgery, the visual cortex had not regained full normal functioning, he further added.

The study suggested that eye surgery can lead to a positive outcome even when performed in adulthood after a life-time of profound blindness. There is however an important caveat.

Giulia Dormal said that the recovery observed in the visual cortex, which was highlighted by a decrease in auditory-driven responses and by an increase in both visually-driven responses and grey matter density with time, was not total.

Indeed, auditory-driven responses were still evidenced in certain regions of the visual cortex even 7 months after surgery, and these responses overlapped with visually-driven responses. This overlap may be the reason some aspects of vision, despite having improved with time, still remained below normal range 7 months after surgery, Dormal further added.

Source: ANI


Recommended Reading

Latest Research News

Learn How Brain Processes Your Daily Life
Studies using brain scans shows that how our brain helps us experience and remember our daily surroundings.
Fish's Sense may Help Restore Spinal Cord Injury Deficits
Scientists explore a potential mechanism that a jawless fish called the lampreys employs to swim again after spinal cord injuries.
Lesbian, Gay, And Bisexual (LGB) Preteens Unveil Higher Social Media Addiction
New study finds that lesbian, gay, and bisexual (LGB) preteens exhibit more social media and mobile phone addiction than straight peers.
Brain Region Linking Short-term to Long-term Memory Discovered
The model for memory consolidation claims that the hippocampus forms new memories and, as time goes on, trains the cortex to store enduring memories.
What Are the Effects of T Cells on Blood Pressure and Inflammation?
A new study explored the link between T immune cells in ill patients and mortality risk.
View All
This site uses cookies to deliver our services.By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use  Ok, Got it. Close

Long-term Blindness Much More Blinding Personalised Printable Document (PDF)

Please complete this form and we'll send you a personalised information that is requested

You may use this for your own reference or forward it to your friends.

Please use the information prudently. If you are not a medical doctor please remember to consult your healthcare provider as this information is not a substitute for professional advice.

Name *

Email Address *

Country *

Areas of Interests