Astro Flex eyewear features full field panoramic view with adjustable temple length and frame angle for a uniform fit. Impact resistant and durable. Includes side shields, available with Rx* lenses. Model 70 - Front Lenses: 0.75mm Pb Equivalency Optical Lead Glass - Includes Side Shields: 0.50mm Pb Equivalency Lead Foil - Optional Rx*: Single Vision (SV) and Bifocal (BI)