Christian Halstead | tomfordsunglasses

Varifocal Glasses: View The World In A New Way

Oct 22nd 2011 at 12:15 AM


Also  known as  Varifocal lenses, or progressive glasses, Varifocals  has the features  of a pair of bi-focal lenses without   the issues  related to the line along the middle. Bifocals are  employed by  people who  has  problem seeing long-distance, but   are finding it hard  to read print or newspaper. People sometimes   realize this  grouping of difficulties as they age, because  the lens  gets looser,  thus  whereas they may  have experienced extreme  myopia as a young adult , they  currently  want  to appear  a lot closely at the book or computer screen. Varifocal glasses provide the wearer the opportunity  to do both at once and  even avoid  the thickness of bifocals.

Bifocals got their bad  fame  in 70s and 80s, because  they were seen as unattractive  and awkward . Lens grinders had  to mix two different  sorts of lens, one enlarging the distance , and  another enlarging the near space. This means  that they often  resorted to using thick glass,  together with a heavy frame to support the two lenses.  They may  even cause problems  with sight  because of the line which  joined one lens to the other not being completely ground away. Wearing these glasses for a long time  would become wearing, and  several people chose  to leave them off because of the effort required  to wear them. Because  bifocals have been  so unpopular with  several wearers, they are  being less frequently  prescribed by opticians, who will   usually request  two pairs of glasses for the myopia  and hyper myopia.

Varifocal glasses are an alternative to the bifocal  that uses  a much thinner lens  to attain  a similar results. Rather than  being two different lenses, the glass is gradually  ground to the desired  consistencies, with the top  portion of the lens being for long viewing, with the lower  half  getting used for close reading. Combining the lenses like this means  that the lens maker can  use  a much thinner piece of glass, and then  employ a lighter frame to support the glasses. In addition , there is no fine line down the middle.

Those who  work in computers, particularly  in IT and computer displays,  usually find  that bifocal lenses are  totally  inappropriate for their needs . Instead, they  select Varifocal glasses that  will be worn for long stretches at a time, and  don't require  the user to change the frames, move the glasses, or do anything  which requires  effort or risks eye strain. Without the line down the middle ,  they could clearly see the screen in front of them, a  important part of their job .

0 comments
Please to comment

sign in

Username
Password
Remember Me


New to IM faceplate? join free!

Lost Password? click here