INCREDIBLY FLEXIBLE FRAMES & NOSE PIECES : Stiff plastic sunglasses can pinch behind your ears. These bifocal glasses are extremely light weight and flexible, so they conform nicely around your head. You can wear these bifocals for hours while playing 18 holes of golf and not even notice they are on. Soft rubber nose pieces prevent slippage, so these polarized readers are perfect for cycling, tennis, baseball, and golf. IMPACT RESISTANT POLYCARBONATE LENSES : When shopping for sunglasses, eye protection should always be a priority. Polycarbonate is an impact resistant thermoplastic that is virtually unbreakable and extremely scratch resistant. Have you tried to break a CD (compact disc) before? It can’t be done! CDs are made of polycarbonate. Your eyes are worth every penny you spend on sunglasses. DANGERS OF BLUE LIGHT : Blue light exposure increases the risk of macular degeneration. Blue light penetrates all the way to the retina (the inner lining of the back of the eye) and can potentially damage the light-sensitive cells in the retina. These HD Bifocal reading glasses can reduce blue light making it safer to look at computers and handheld devices YELLOW NIGHT VISION LENSES : Yellow lenses reduce the halo effect around lights at night. They also enhance colors at night and sharpen vision. You will often find Shooting glasses with yellow tint to help increase contrast and clarity. Yellow sunglasses are excellent for motorcycle riding and cycling at night. NEAR INVISIBLE BIFOCAL LINE : We all will need to wear bifocal eyewear at some point in their lives. But does the whole world need to notice those unsightly bifocal lines? The magnified reading area at the bottom of these lenses are injection molded, which means you can’t feel the bifocal line on the lenses. The front of the lens is smooth, like nothing is there. It’s visible from the back of the lens, however, but not so much on the front of the lens. Kumatage rimless BIFOCAL glasses are made for the avid outdoorsman and outdoorswoman! Sporty, sleek rimless style is lightweight and comfortable. Now you can play golf, tennis, baseball, run, cycle, hike, drive or ride motorcycle and be able to read maps, scorecards, menus, GPS or smart phone without switching glasses! Choose from yellow, grey or high definition copper lenses. Yellow tinted glasses also known as night vision glasses are popular for night riding and night driving since yellow tint can reduce headlight halo effect at night. Yellow glasses are also great for cloudy days and raining days, too. High Definition - HD copper lens sunglasses filter out the blue light in the UV spectrum, which causes haziness; leaving a clearer and crisper view. HD sunglasses are similar to the original Blue Blockers, except Blue Blockers are more orange in color. Compared to Blue Blockers, HD glasses provide a more natural view. With Copper HD, you can see your golf ball after your drive it 250 yards. You will also enjoy the clarity and comfort on those long road trips. Available in the following reading powers: +1.50, +2.00, +2.50 or Higher. Fits Medium to Large head sizes.