Sometimes when you drive down the road, you may find sun shining in your eyes. You may search in vain for those clip-on or magnetically attached sun lenses that came with your prescription eyeglasses. At times like these, you might find that prescription sunglasses are much more convenient and more than worth the additional investment. Sometimes you may not want to wear your contact lenses on the beach where your eyes can become itchy and watery as you battle the effects of sand, sun, wind and water. Even the non-prescription sunglasses you wear over your contact lenses may not provide enough protection. But with prescription sunglasses, you have the option of wearing them anytime outdoors without the need to search for clip-on sunglasses or deal with contact lenses.