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Two main categories of bifocal specs Published: 09.04.2010 | Author: udtekadapter | Category: Health And Fitness
Bifocal reading glasses have undergone a long history since its invention which happened more than two hundred years ago. A basic point of these eyeglasses is that they can provide both presbyopia and nearsightednessfarsightedness correction. This can also be considered as the most significant improvement compared with regular reading glasses. In fact Mattias Janmark Womens Jersey , bifocal specs have been continuing its progression after making such a significant breakthrough. For certain, the basic design principle will not change as its name suggests. A pair of bifocal eyeglasses will provide those basically two forms of visual aids for ever. However, a lot of new, specific designs have been brought into existence during the past years since its origin. Currently Radek Faksa Womens Jersey , all lens designs of bifocals can be grouped into two mainly categories: Franklin bifocals and bifocals with reading segments in a small size.


The first category is also the original bifocal design. This initial form was developed by Benjamin Franklin by cutting two lenses in half and combining them together. So, a bifocal lens of Franklin鈥檚 style has a half portion for reading and the other half for distance vision. Using these bifocal specs, wearers can naturally look down to read materials and look up through to view objects in the distance. All things seem good and feasible. One point of this simple design is that these two focal points have been fixed into each half part. In some cases, it is inflexible for certain users to perform customized visual tasks. The current situation in the market is that bifocal reading glasses of this design can seldom be seen. There exist more flexible and helpful designs.


The second category of bifocal lens designs takes reading segment as the fundamental concept. bifocal specs within this category all take use of reading segments molded into a primary lens. These different designs differ in the shape and position of the reading segment. For instance John Klingberg Womens Jersey , available shapes include half-moon or D shape, round, narrow rectangle and so on. While most reading segments are situated in the lower part of the lens, there is a special design called double-D that molds two reading segments into the upper and lower sections respectively.


C: Bifocal specs have developed several different designs after more than two hundred years鈥?progression. There are mainly two categories Dan Hamhuis Womens Jersey , respectively the Franklin bifocals and bifocals with small reading segments.


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by Yoo Seungki


SEOUL, March 5 (Xinhua) -- U.S. envoy to South Korea Mark Lippert was injured on Thursday morning in a knife-wielding attack by a South Korean male assailant who shouted opposition to the ongoing U.S.-South Korea joint annual war games.


Lippert, U.S. ambassador to Seoul who took office last year as the youngest envoy for the post Authentic Jason Spezza Jersey , was slashed in his cheek and hand with a knife blade at about 7:40 a.m. local time when he was preparing for a lecture at a venue in Sejong Cultural Center in central Seoul.


The assailant was Kim Ki-jong, 55, head of a South Korean progressive cultural activity group. In July 2010, Kim received a suspended two-year jail term for throwing two pieces of concrete at the Japanese ambassador to Seoul.


While being arrested Authentic Alexander Radulov Jersey , Kim shouted his strong opposition to "war exercises," apparently indicating the South Korea-U.S. annual military exercises code-named "Key Resolve" and "Foal Eagle" that kicked off Monday.


Lippert was quickly taken to a nearby hospital to receive treatment on his cut in right face and in left hand.


The envoy, believed to be one of closest aides to U.S. President Barack Obama, gained popularity among South Koreans for his amicable actions and words toward the country. He gave a Korean name Authentic Ben Bishop Jersey , Sejun, to his son born in Seoul in January, and it was posted online through his SNS account.


After the attack, the White House condemned the act of violence Authentic Stephen Johns Jersey , saying that President Obama had called Lippert and wished his speedy recovery. It was the first attack against a U.S. ambassador to South Korea.


Concerns spread that such an act of violence may worsen the South Korea-U.S. alliance. Worries recently emerged over ties between Seoul and Washington as comments by U.S. Undersecretary of State Wendy Sherman on South Korea-Japan relations raised controversy.


Sherman said Friday that it would not be hard for "a political leader anywhere to earn cheap applause by vilifying a former enemy, " referring to frosty relations between South Korea and Japan. Her comments were interpreted as the United Sates taking sides with Japan in the issue on wartime history shared by Seoul and Tokyo.


The attack on the U.S. envoy represented an anti-American sentiment shared by some South Koreans that hostile U.S. policy on the Democratic People's Republic of Korea (DPRK) may delay the reunification of the two Koreas.


Asked why he targeted the U.S. ambassador, Kim told reporters that the U.S. would "restore its reason" by his act, saying the South Korea-U.S. war games have prevented Korean families Authentic Brett Ritchie Jersey , separated by the 1950-53 Korean War, from being reunited. The assailant said he did the "right thing to do" as he has protested against war in the past 30 years.


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