subject: Proper Vision With Varifocal Glasses [print this page] Also known as Varifocal lenses, or progressive glasses, Varifocals has the features of a pair of bi-focal lenses without the problems related to the line along the middle. Bifocals are utilized by people who have trouble seeing long-distance, however are finding it hard to read print or newspaper. People generally realize this combination 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 chance to do both at once and even prevent the thickness of bifocals.
Bifocals got their bad fame in the 70s and 80s, because they were seen as unappealing and uncomfortable. Lens grinders had to mix two different types of lens, one enlarging the space, and another enlarging the near space. This means that they usually resorted to using thick glass, together with a heavy frame to support the two lenses. They could also cause issues 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 could become wearing, and several people selected to leave them off because of the effort required to wear them. Since bifocals have been so unpopular with many wearers, they are being less frequently prescribed by opticians, who can usually request two pairs of glasses for the myopia and hyper myopia.
Varifocal glasses are an alternative to the bifocal which uses a much thinner lens to achieve the same results. Rather than being two different lenses, the glass is slowly ground to the desired consistencies, with the top part of the lens being for long viewing, with the lower part being used for close reading. Combining the lenses like this means that the lens maker will use a much thinner piece of glass, and then use a lighter frame to support the glasses. Additionally, there is no fine line down the middle.
People who work in computers, particularly in IT and computer displays, often find that bifocal lenses are totally unsuitable for their needs . Instead, they choose Varifocal glasses that can be worn for long stretches at a time, and do not require the user to change the frames, move the glasses, or do anything which needs 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 work.
