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Eyeglasses that turn into sunglasses -- at your command

Date:
January 28, 2015
Source:
American Chemical Society
Summary:
Imagine eyeglasses that can go quickly from clear to shaded and back again when you want them to, rather than passively in response to changes in light. Scientists report a major step toward that goal, which could benefit pilots, security guards and others who need such control.
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A new kind of glasses go from clear to shaded on command.
Credit: American Chemical Society

Imagine eyeglasses that can go quickly from clear to shaded and back again when you want them to, rather than passively in response to changes in light. Scientists report a major step toward that goal, which could benefit pilots, security guards and others who need such control, in the journal ACS Applied Materials & Interfaces.

In the study, led by Anna Österholm in John Reynolds' group at the Georgia Institute of Technology, the researchers point out that most transitional lenses now on the market don't meet many users' needs. When wearers are driving or wearing a baseball cap, for example, the lenses stay clear rather than switching to a darker shade even in broad daylight. Also, the majority of available versions don't block out the harshest light, such as bright light reflected off snow. And the change from colored to clear can take several minutes, which has safety implications for certain users including airline pilots. Reynolds' team wanted to find a way to solve these issues.

The researchers designed a new kind of lens that can switch within seconds from clear to darkly shaded and back again in response to a small electrical charge that a wearer could control. They can also fine-tune the color of the lenses to match the full range of hues used in commercial sunglasses. To make the lenses, they say they used a method that could be easily scaled up for manufacturing.


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Materials provided by American Chemical Society. Note: Content may be edited for style and length.


Journal Reference:

  1. Anna M. Österholm, D. Eric Shen, Justin A. Kerszulis, Rayford H. Bulloch, Michael Kuepfert, Aubrey L. Dyer, John R. Reynolds. Four Shades of Brown: Tuning of Electrochromic Polymer Blends Toward High-Contrast Eyewear. ACS Applied Materials & Interfaces, 2015; 7 (3): 1413 DOI: 10.1021/am507063d

Cite This Page:

American Chemical Society. "Eyeglasses that turn into sunglasses -- at your command." ScienceDaily. ScienceDaily, 28 January 2015. <www.sciencedaily.com/releases/2015/01/150128113951.htm>.
American Chemical Society. (2015, January 28). Eyeglasses that turn into sunglasses -- at your command. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/01/150128113951.htm
American Chemical Society. "Eyeglasses that turn into sunglasses -- at your command." ScienceDaily. www.sciencedaily.com/releases/2015/01/150128113951.htm (accessed May 24, 2017).

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