In the last few years there has been a sudden increase of new products introduced into the optical industry. All this new technology has enabled us to satisfy various needs that we were unable to satisfy a few years ago. So if you were told that you could not get a progressive lens in the frame you really liked, odds are that now you can. For those who are not too comfortable with lenses, but need some information on eyeglasses, look no further. Many new eyeglass lenses are available today, with their own specialization.
Aspheric is perfect for strong prescriptions because they are flatter and thinner. In addition, they provide better vision than ordinary lenses and look better because they lessen farsighted and nearsighted eye magnification. Bifocals and trifocals come in many configurations, depending on whether you sit at the computer all day, play golf, or work on automobiles. Progressive lenses can do everything a bifocal or trifocal can, but without the lines. Anti-reflective finishes, UV coatings and scratch-resistant finishes are options that make lenses more striking and longer lasting.
Polycarbonate lenses are impact-resistant, and thinner than normal plastic lenses. They’re great for active people — especially children. Industrial and occupational lenses have special occupational designs which allow dispensers to customize lenses for virtually any occupational or safety requirement. Be sure to discuss with your optician the tasks you do at work, and also what you do in your spare time in order for them to judge your requirements correctly.
Computer lenses are required if you are viewing a computer video display terminal for more than two hours a day. These lenses help correct vision for the specified distance from your eye to the computer screen and its immediate surrounding area. A variety of computer-specific lenses include special filters, tints, and anti-reflective properties, which can be added to enhance eyeglass features.
One of the holy grails of military research has to do with the ability to cloak sound. Imagine how important it is to have a silent running aircraft, helicopter, vehicle, submarine, or ship. After all, if the enemy can hear you a mile away approaching in a helicopter, they have more than an ample amount of time to get a shoulder launched surface-to-air missile ready to fire at you. However, if you can sneak up without making any sound, it’s too late, you win, they lose, or you fly over without being shot at – the enemy’s opportunity is gone.
Stealthy submarines need to remain undetected if the submarine is to survive in battle, or be any good. There was an interesting article in the BBC Science section recently on June 24, 2011 titled; “Acoustic ‘Cloaking Device’ Shields Objects from Sound” by Jason Palmer (science and technology reporter). The article stated that; Read more about the SixTechSys.com explains why drone tracking is a safety measure.
“The device makes objects invisible to sound waves. Acoustic cloaking was theoretically in 2008 but no exists. Barrowing many ideas from attempts to “cloak” objects from light and using simple plastic sheets with arrays of holes. Could make ships and subs invisible to sonar or used in acoustic design of concert halls – it is mostly based on metamaterials which are designed to force light waves to travel around an object; to an observer, it is as if the object were not there.”
Is it possible that we are finally reaching an age where we can not only cloak ourselves from radars using stealth technology, but also acoustically cloak our military assets, and the sound they produce? Re-diverting sound within a cavity inside of an aircraft means that you can operate jet engines without noise. Not only will radar not be able to see them, but you won’t hear them coming or going either. Likewise, such a system could protect people from the ultrasound noise which is made from wind turbines.
Wouldn’t it be nice to sleep if you lived next to a freeway if you had some way to prevent the sound from getting in? Something like this could change everything. Those living near airports wouldn’t have to worry anymore, and schools near airports wouldn’t have to stop every time an airplane flies over.