Sunglasses
Just because you have to wear bifocal prescription lenses doesn't mean you can't wear fashionable sunglasses as well.
Prescription sunglasses are now available for just about any type of lenses, such as bifocals and progressive lenses, and are also available in all lens materials. For comfort high-index and polycarbonate lenses are usually better choices than glass.
A popular option for prescription eyeglass wearers is choosing photochromic lenses. These lenses automatically darken outdoors, when exposed to high levels of light, and lighten when you're indoors. They reduce the need to wear prescription sunglasses in most outdoor situations.
Prescription sunglasses can offer a break from the inconvenience of fighting outdoor elements such as wind and water for people who wear contact lenses. The advantage for those who wear eyeglasses is they don't have to hassle with searching for their clip-on sun lenses.
Regardless of the type of vision correction you use your overriding concern when choosing prescription sunglasses is finding lenses that block 100% of the sun's UV radiation. Don't let the color of the lens fool you. Your eye doctor will be able to help you choose lenses that provide complete protection.
You might also want to consider polarized sunglasses if you spend a lot of time outdoors. These provide additional glare protection from light reflected from surfaces such a roads, water and snow.