Guard Dogs Rx Insert - Fits All Models

Available for all Guard-Dog models - this lightweight insert can be easily adapted to become a cost effective prescription solution. *Simply take the insert to your eye doctor and have them fill it with your prescription. Product Limitations: CR-39 Lens Material ANSI Z-87.1 Certified Spherical Range ?4.00D Cylinder Range ?2.00D Prism Distance To 3? PD or Pupil Distance must be submitted with every order Multifocal Add Power ?4.00D. No Progressive Lenses. No Full-Width Bifocals. No Double Segments.