eMEMBERSHIP  LOGIN

A Telescope for the Eye

Posted on July 25, 2013, 6 a.m. in Age-related Macular Degeneration Biotechnology
A Telescope for the Eye

In age-related macular degeneration (AMD) – the leading cause of blindness in the elderly, there is loss of central vision due to damage to the eye’s retina.  Visual aids that magnify incoming light help AMD patients see by spreading light around to undamaged parts of the retina. While these optical magnifiers can assist patients with a variety of important everyday tasks such as reading, identification of faces, and self-care, these devices have not gained widespread acceptance because they either use bulky spectacle-mounted telescopes that interfere with social interactions, or micro-telescopes that require surgery to implant into the patient's eye.  Joseph Ford, from the University of California/San Diego (UCSD, California, USA), and colleagues have developed a slim, telescopic contact lens that can switch between normal and magnified vision. The new lens system uses tightly fitting mirror surfaces to make a telescope that has been integrated into a contact lens just over a millimeter thick. The lens has a dual modality: the center of the lens provides unmagnified vision, while the ring-shaped telescope located at the periphery of the regular contact lens magnifies the view 2.8 times. To switch back and forth between the magnified view and normal vision, users would wear a pair of liquid crystal glasses originally made for viewing 3-D televisions. These glasses selectively block either the magnifying portion of the contact lens or its unmagnified center. The liquid crystals in the glasses electrically change the orientation of polarized light, allowing light with one orientation or the other to pass through the glasses to the contact lens.  The team tested their design both with computer modeling and by fabricating the lens. They also created a life-sized model eye that they used to capture images through their contact lens-eyeglasses system. Tests showed that the magnified image quality through the contact lens was clear and provided a much larger field of view than other magnification approaches, but refinements are necessary before this proof-of-concept system could be used by consumers.

View news source…

Eric. J. Tremblay, Igor Stamenov, R. Dirk Beer, Ashkan Arianpour, Joseph E. Ford.  "Switchable telescopic contact lens.”  Optics Express, Vol. 21, Issue 13, pp. 15980-15986 (2013).a

  

Health Headlines MORE »

Curcumin blocks the protein that is overexpressed in colon cancer.
Men and women ages 55+ diagnosed with MCI may be at four-fold increased risk of developing dementia or Alzheimer's disease.
Regimen of self-monitoring of blood pressure combined with an individualized self-titration algorithm
Due to its effect on the GI system, antibiotics in early life may raise infectious disease risk in later years.
Compound derivatives of punicalagin may lead to a treatment for Alzheimer’s disease.
Over 1.6 million cardiovascular-related deaths per year can be attributed to sodium consumption above the World Health Organization's recommendation of 2 gm per
Density of street network design, as well as accessible public transportation, can impact residents’ weight and disease risks.
To learn new sequences of movement (motor learning), the brain requires sleep to consolidate the new information.
Use of the Internet and email associates with less cognitive decline, among older men and women.
Dietary supplementation of phosphatidylserine may help to normalize the stress reaction, among men.