Three types of multifocal lens

Multifocal lenses are lenses with "multiple centers of focus". People may suffer from more than one vision error or several vision problems in different situations. Without the invention of multifocal lens, eye wearers must keep several separate pairs of glasses for different vision purposes. For example, a first one is for myopia, a second one for hyperopia, and even a third one for computer working. Now, multifocal lenses can solve all these vision problems within a single pair. How amazing it is!

Multifocal lens is just a general concept. There are actually there types of multifocal lenses: bifocal lenses, trifocal lenses and progressive lenses.

Bifocal lenses are the most popular form of multifocal lenses. You can consider a bifocal lens just as a multifocal lens with only "two points of focus". They allow people to see things in the distance as well as close up. This type of multifocal lens is suitable for people with both myopia and presbyopia. One of the most famous people was Franklin, who was also the father of initial bifocal lenses. Statistics show that more than half of the people who wear eyeglasses wear these "two points" multifocal lenses.

Another form of multifocal lenses is trifocal lenses. In similar, trifocal lenses have "three points of focus". This type of multifocal lens features three vision correction functions. They have medium viewing capability, in addition to distance viewing and close reading possessed by bifocal lenses.

The third form of multifocal lenses is progressive lenses. This type of multifocal lens has so many focal points that it leads to a more true vision correction solution. Progressive lenses also remove the visible line on bifocals and trifocals, making the lenses more natural and achieving aesthetic performance. Of course these multifocal lenses are more complex in design so that they are more expensive.

What is contact lens or contact lenses

The contact lens was invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím for correction purpose use only, as glasses. Because the contact lens is light than glasses,so many people like it.

Modern contact lenses deliberately colored, so be used as cosmetic.

As we know, 125 million people use all different contact lens or contact lenses in the world,including 28 to 38 million in the United States and 13 million in Japan. The number is increasing because more and more people using PC to work, which consider as the major reason cause people eyes'sight problems.

There are several types of contact lens:
toric lenses
multifocal lenses
extended wear lenses
disposable contact lenses
disposable lens

contact lens solutions