Enjoy a classic pair of bifocal with a built-in magnification lens conveniently located on the bottom of the sunglass lenses and are great for reading outdoors. If you are able to see the distance without the assistance of prescription glasses and only require reading glasses with the added bonus of UV400 protection for outdoor use then bifocal outdoor reading glasses are your answer<br>. 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. Bifocal sun readers are available in 12 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. The weight is less than 2 ounces. Reinforced Spring Hinges. 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 on the left shows stretched open for maximum flexibility and are able to remain that way all day without snapping like a traditional pair would. The image on the right shows the armband not stretched. - UV400 lenses; 100% UVA and UVB for your eye protection. - EYE HEALTH - Bifocal help you preserve your eye health by reducing eye strain and fatigue. - COST SAVINGS - Because youll no longer need multiple pairs of glasses; bifocal sun readers save you money. - EASE OF USE - Reading glasses + bifocal combined are convenient. Its just that simple. No longer will you need to carry multiple pairs of glasses around with you. - Microfiber Soft Pouches Included (USD10 value).