Mass Vision brings the finest in reading glass clarity and sunglass eye protection to outdoor reading while giving you a casual style. With 2 color options and 9 different reading glass strengths you will surely find a pair that suits your needs. The gradient shatterproof lenses block 100% of harmful UVA and UVB rays. The lenses are impact resistant and do not scratch easily. You will no longer need to juggle between sunglasses and reading glasses outdoors. Reinforced Spring Hinges for Maximum Comfort. The hinges are equipped with a small spring that allows the arms a greater range of movement and does not limit them to the traditional 90 degree angle. These hinges provide greater flexibility and comfort and are more able to withstand everyday use. Spring hinges will flex to your head size and give you a comfortable squeeze which make them great for outdoor activities. The image above shows stretched open for maximum flexibility and are able to remain that way all day without snapping like a traditional pair would. Choose a Size and Reading Lens Strength that is Right for you. Of course we all want that perfect frame fit and equally important the right reading lens strength. Mass Vision sun readers are available in 9 different lens strengths and 2 different colors. The accompanying chart shows the measurements in inches but you may also see the measurements in millimeters towards the top of this page. These sunglasses weighs less than 1 ounce. 100% UVA and UVB for maximum eye protection. - EYE HEALTH - Reading Sunglasses help you preserve your eye health by reducing eye strain and fatigue. - COST SAVINGS - Because youll no longer need multiple pairs of glasses; full reader sunglasses save you money. - EASE OF USE - Sun Readers are convenient. Its just that simple. No longer will you need to carry multiple pairs of glasses around with you.