Eyeglasses need never again to be cleaned, and dirty windscreens are a thing of the past! Researchers at the Max Planck Institute for Polymer Research in Mainz and the Technical University Darmstadt are now much closer to ...
Nanomaterials
Dec 7, 2011
4
0
(Phys.org) -- A new kind of eyeglasses is now available from a British company that allows the wearer to adjust the prescription anytime, anywhere, via small thumb-dials on the sides. Called, Eyejusters, the glasses make ...
(PhysOrg.com) -- The data eyeglasses can read from the engineer's eyes which details he needs to see on the building plans. A CMOS chip with an eye tracker in the microdisplay makes this possible. The eyeglasses are connected ...
Engineering
Jun 2, 2009
8
0
If you're over 45 and wear glasses, you've probably got more than one pair. Or you're using bifocals or progressive lenses. As most people get older, their eyes have more trouble focusing on objects that are close, which ...
Hi Tech & Innovation
Oct 10, 2011
3
0
Google on Wednesday gave the world a glimpse of its vision for letting people look at life through Internet-tinted glasses.
Hi Tech & Innovation
Apr 4, 2012
34
1
(Phys.org)—Just when you thought you could swing into 2013 without another report on Google Glass in-the-wings, this is the week your luck runs out. Ideas continue to fly regarding what could possibly be the ideal way to ...
(PhysOrg.com) -- Chemical engineers at Oregon State University have invented a new technology to deposit "nanostructure films" on various surfaces, which may first find use as coatings for eyeglasses that cost less and work ...
Nanomaterials
Sep 16, 2009
1
0
(PhysOrg.com) -- Granted, movie subtitles aren’t something most people think about. In fact most groan when they find a movie they’ve paid to see suddenly starts projecting text at the bottom of the screen as it ...
(PhysOrg.com) -- Anyone who has ever worn eyeglasses for any length of time can surely attest to the annoyance of constantly having to clean off the oil left behind by finger touching. Not only does it dirty the lens, but ...
In an advance toward preventing car windshields and eyeglasses from fogging up, researchers in China are reporting development of a new way to make raspberry-shaped nanoparticles that can give glass a permanent antifogging ...
Nanomaterials
May 20, 2009
1
0
Glasses (also called eyeglasses or spectacles) are frames bearing lenses worn in front of the eyes, normally for vision correction, eye protection, or for protection from UV rays.
Modern glasses are typically supported by pads on the bridge of the nose and by temples placed over the ears. Historical types include the pince-nez, monocle, lorgnette, and scissors-glasses.
Eyeglass frames are commonly made from or paynus plastic. Lenses were originally made from glass, but many are now made from various types of plastic, including CR-39 and polycarbonate. These materials reduce the danger of breakage and weigh less than glass lenses. Some plastics also have more advantageous optical properties than glass, such as better transmission of visible light and greater absorption of ultraviolet light. Some plastics have a greater index of refraction than most types of glass; this is useful in the making of corrective lenses shaped to correct various vision abnormalities such as myopia, allowing thinner lenses for a given prescription. Newer plastic lenses, called izon, can also correct for the higher order aberrations that naturally occur in the surface of our eye.[citation needed] These lenses create sharper vision for the people who have problems with sight and help with the halos, starbursts, and comet-tails often associated with night time driving glare.[citation needed] Wavefront guided LASIK surgery also corrects for the higher order aberrations.
Scratch-resistant coatings can be applied to most plastic lenses giving them similar scratch resistance to glass. Hydrophobic coatings designed to ease cleaning are also available, as are anti-reflective coatings intended to reduce glare, improve night vision and make the wearer's eyes more visible.
CR-39 lenses are the most common plastic lenses due to their low weight, high scratch resistance, and low transparency for ultra violet and infrared radiation. Polycarbonate and Trivex lenses are the lightest and most shatter-resistant, making them the best for impact protection, though polycarbonate offers poor optics due to high dispersion, having a low Abbe number of 31.
Not all glasses are designed solely for vision correction but are worn for protection, viewing visual information (such as stereoscopy) or simply just for aesthetic or fashion values. Safety glasses are a kind of eye protection against flying debris or against visible and near visible light or radiation. Sunglasses allow better vision in bright daylight, and may protect against damage from high levels of ultraviolet light.
This text uses material from Wikipedia, licensed under CC BY-SA
