If you didn't have bifocals, you'd have to take off one pair of glasses to replace them with a pair of readers every time you needed to shift from viewing something at a distance to looking at something up close.
The good news is, even if you wear a complicated prescription (as with the bifocals, trifocals, and progressive lenses mentioned above), you won't have a hard time finding a pair of sunglasses that fit all your needs simultaneously.
If you do wear bifocals, though, you may want to get the opinion of an optician before committing to a purchase, so visiting a brick-and-mortar store that offers Bellagio frames to try on a few pairs will be in your best interest.
This remarkable feat is accomplished through photochromic technology, and even better is the fact that these special lenses are compatible with a wide range of prescriptions, including bifocals and trifocal recommendations.
Visionworks runs different promotions throughout the year, such as two pairs of eyeglasses for $99.00, one pair of prescription reading glasses for $29.00, and two pairs of no-line bifocals for $149.00.