Navigation Links
Study Confirms Effectiveness of Innovative Prism Glasses For Hemianopia Patients
Date:5/19/2009

Suggests additional training to help brain adapt more fully and further enhance benefits

BOSTON, May 19 /PRNewswire-USNewswire/ -- In a study of specially designed peripheral prism glasses for hemianopia patients (blinded in half the visual field in both eyes), scientists found that two-thirds of patients continued to wear the glasses at the end of the study period and beyond, indicating a high level of success. They also found that the brains of patients had not fully remapped to adjust for the prisms, which means that improved training in their use could further enhance the benefits, says principal investigator, Dr. Eli Peli, a senior scientist at Schepens Eye Research Institute and inventor of the glasses.

The study, published in the May 2009 issue of Optometry and Vision Science, not only reaffirms previous clinical studies, but also adds a deeper understanding of the neurological processes at play when a patient uses prisms for this purpose, adds Peli.

More than a million Americans suffer from hemianopia, which blinds the vision in one half of the visual field in both eyes -- the result of strokes, tumors or trauma. Hemianopia patients are often unaware of what they cannot see and frequently bump into walls, trip over objects or walk into people on the side where the visual field is missing.

The prisms, attached above and below the center of a spectacle lens in Peli's invention, shift images from one side of the visual field to the other side and alert patients to objects and obstacles not otherwise visible to them. Alerted to the existence of these objects, patients turn to look, or, if their brains are fully adapted (remapped), perceive quickly where the objects are and automatically avoid them without turning their eyes and head. (In earlier designs by other scientists, the prism was in the middle of the lens and caused double vision.)

"The best case scenario," says Peli, "is for a patient to be able to make rapid decisions based on the perception rather than moving their heads when an unseen object is detected."

Peli and his team asked 28 patients with complete hemianopia to wear the peripheral prism glasses as much as possible for the duration of the study, which averaged about nine weeks. Success was measured by continued wear, visual field expansion, perceived direction (caused by brain remapping), and perceived improvement in quality of life.

The research team found that 67 percent of patients chose to continue to wear the glasses at the end of the study. They also found that all patients had expansion of their visual field of about 22 degrees and expressed reduced difficulty in noticing and avoiding obstacles. On the other hand, only two patients demonstrated even an intermittent adaptation to the change in visual direction produced by the peripheral prism glasses, which means that no patient had remapped his or her brain to automatically make the perceptual adjustment.

Based on these results, Dr. Peli and his team plan to conduct future research that will examine the best way to train patients to reprogram their brains to perceive direction automatically.

The research team consisted of Mr. Robert Giorgi and Drs. Russell Woods and Eli Peli, all of the Schepens Eye Research Institute.

This study was conducted with a prototype of the glasses, on which the prisms are temporarily applied. There are now permanent prism glasses available, which continue to be studied and perfected in on-going multi-center trials.

Patients interested in trying the peripheral prism glasses can contact Chadwick Optical for referral to a doctor in their area. Go to http://www.chadwickoptical.com/ for contact information.

Schepens Eye Research Institute is an affiliate of Harvard Medical School and the largest independent eye research institute in the nation.


'/>"/>
SOURCE Schepens Eye Research Institute
Copyright©2009 PR Newswire.
All rights reserved

Related medicine technology :

1. Dendreon Announces Publication of Phase 1 Study Highlighting Immunologic and Clinical Activity of Lapuleucel-T (Neuvenge(R)) in Advanced Breast Cancer Patients
2. EDAP Announces Launch of Clinical Study Combining HIFU and Chemotherapy for Localized Aggressive High Risk Prostate Cancer
3. Cephalon Announces Positive Results from a Pivotal Study of FENTORA in Opioid-tolerant Patients with Non-cancer Breakthrough Pain
4. Allos Therapeutics Initiates Study of PDX in Patients with Cutaneous T-Cell Lymphoma
5. Multiple Myeloma Research Consortium (MMRC) Partners with Novartis to Advance Phase II Study of Deacetylase Inhibitor
6. Potential Safety Issue Identified in Ongoing Phase 2 Clinical Study of HCV-796
7. Study Suggests High-Dose Fish Oil May Significantly Improve Behavior in Children with ADHD
8. MicroDose Announces Positive Results From the QDose Inhaled Insulin Glucose Clamp Study
9. Video: Landmark Study in The Lancet: Patients Treated With Betaseron(R) After First MS Attack Experienced Significant Delay in MS Progression
10. MacroGenics Begins Global Phase 2/3 Protege Study in Recent-onset Type 1 Diabetes Mellitus
11. Sarasotas Roskamp Institute Releases Study Defining a Mechanism for Development of Obesity and the Metabolic Syndrome, Forerunners of Type 2 Diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/30/2016)... New York , May 30, 2016 ... market report titled, "Advanced (3D/4D) Visualization Systems Market - ... 2016 - 2024." According to the report, the global ... 1.8 Bn in 2015 and is anticipated to expand ... to reach US$ 3.2 Bn in 2024. ...
(Date:5/30/2016)... May 30, 2016 On 28 May, ... hepatitis by 2030. At the 69 th World Health ... Viral Hepatitis Strategy, signalling the greatest global commitment in viral ... of eliminating hepatitis B and C by 2030 and includes ... will reduce annual deaths by 65% and increase treatment to ...
(Date:5/27/2016)... , May 27, 2016  A new study highlights the necessity of health literacy ... Journal of the American College of Radiology , a majority of oncology patients undergo ... Photo - http://photos.prnewswire.com/prnh/20160527/373022 ... ... Medical Diagnostic Imaging Ampronix ...
Breaking Medicine Technology:
(Date:5/31/2016)... Miami, FL (PRWEB) , ... May 31, 2016 , ... ... the wellness industry, today released ten predictions on the future of wellness, travel, spa ... CEOs of top travel, spa and beauty companies to leading economists and researchers - ...
(Date:5/31/2016)... ... May 31, 2016 , ... In his latest video, ... traits in humans. Using presidential candidate Donald Trump as an example, Kalsi describes ... “AstroNumerology is not about adding numbers up,” says Kalsi. “It is about looking ...
(Date:5/31/2016)... (PRWEB) , ... May 31, 2016 , ... The Orthopaedic ... executive committee members: , David G. Lewallen, MD, began his term as president ... president. Michael L. Parks, MD, is OREF’s new president-elect. Richard F. Kyle, MD, will ...
(Date:5/31/2016)... , ... May 31, 2016 , ... Phynd Technologies, Inc. ... GA; Houston Methodist – Houston, TX and Shore Medical Center – Somers Point, NJ. ... three different, leading EHR solutions, demonstrating the breadth of Phynd’s solution and its interoperability. ...
(Date:5/31/2016)... ... ... In a recent interview on The Greenburgh Report radio show hosted by ... (1460 AM), leading medical insurance advocate Adria Goldman Gross discussed several eye-opening issues ... , During the interview with Mr. Feiner that aired on May 7, 2016, ...
Breaking Medicine News(10 mins):