Bifocal sunglasses are generally prescription glasses with lenses which have two different optical powers and generally prescribed to people suffering from presbyopia and who also require a correction for myopia, hyperopia and/or astigmatism.
Since bifocal sunglasses can be used as reading glasses as well as sunglasses, you need to have a prescription before you prepare to buy these glasses.
An advantage of these glasses is that they are available in different styles which mean that your choice is no longer restricted to thick framed and dull looking reading glasses as before. You can choose the types that you like most and fit your face most. If you are an outdoor enthusiasts, or your work requires frequent outdoor activities, you can also choose polarized bifocal sunglasses, which are not only able to block the harmful UV rays of the sun but also the harsh glare that other sunglasses cannot block off.
