Not necessarily, the stress is not necessarily uniform. They do look a bit like the lens base and iridium coating have expanded and contracted at different rates. In the one photo it follows the curve of the frame, maybe the frame was hot and some of the heat leached out into the lens. Peculiar effect however it happened.This is bizzar, even if it wa stress cracks it should appear onnboth sides and cover 100% of the lense... I hope mine dont do that! Wih i could be more help!!