The Effect of Multiple Antireflective Coatings and Center Thickness on Resistance of Polycarbonate Spectacle Lenses to Penetration by Pointed Missiles

Abstract

We have confirmed previous observations that polycarbonate lenses are more susceptible to penetration by sharp, high-speed missiles than blunt missiles. We have also found that reducing lens center thickness and applying a MAR coating further reduces the penetration resistance. Therefore, the use of 2-mm center thickness and MAR-coated polycarbonate lenses should be discouraged for industrial eye protectors where sharp missile hazards are possible.