It should be the Oxidation problem. The glasses should be stored at temp above 5C and below 40C, RH, 90% and keep away from solvents , solvent vapors or any corrosive materials as these may seriously reduce the impact protection provided by the spectacle.
Pls try to clean the lens with soap and warm water. Hope it can settle your problem.
By the way, we have replaced 900pcs in 2013 due to this problem. So this time we can’t offer any replacement for you. Pls noted