What's the Difference Between a Bifocal and a Varifocal?
If you are under 40 these words may mean nothing to you and if you are over 40 may be words you have heard people (especially us optician types!) using – but what are they? A bifocal is simply a lens that has 2 (bi) focusing distances (focal). The distances are usually made up as long distance and reading distance although there are many variations. This allows the wearer to see for far away tasks such as driving, television or for some people just essential for getting aro