IT'S A NATURAL PROTECTOR 0F THE EYES Melanin tinted pigment in the lenses helps reduce glare & eye strain, improves contrast, reduces the risk of cataracts Optical Frame with a case Spring Hinge , Gunmetal Size 1 3/4"x 5 1/2" Available in NO power, +100, +150, +200, +250 SCRATCH RESISTANT coating Special corporate rates available on this item for large orders.(min. 12)Call 1-800-789-6322