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ThunderCactus · November 30th, 2016, 15:00

Microfractures are what cause lenses to break apart when hit. But can you tell when a lens is going to blow apart on the inside like that? Really doubt it.
It's usually due to the lens not being flexible enough, so instead of flexing to absorb impact, it blows apart on the inside. But can be caused by hardening over time, like exposure to chemicals. Not sure if UV exposure does the same thing.
If you have an impact dimple on your lens, then you should replace it. Dimples are induced stress and weaken the lens. Regardless, you probably shouldn't go more than 2 seasons with the same set of lenses.

November 30th, 2016, 15:00	#88
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	Microfractures are what cause lenses to break apart when hit. But can you tell when a lens is going to blow apart on the inside like that? Really doubt it. It's usually due to the lens not being flexible enough, so instead of flexing to absorb impact, it blows apart on the inside. But can be caused by hardening over time, like exposure to chemicals. Not sure if UV exposure does the same thing. If you have an impact dimple on your lens, then you should replace it. Dimples are induced stress and weaken the lens. Regardless, you probably shouldn't go more than 2 seasons with the same set of lenses.