It’s sad we have to consider life expectancy of our pricy sunglasses to be so short.
Unfortunately, unless you're picking a glass lens, you don't get the option of a durable polycarbonate lens unless you want to compromise on optics. Those coatings help with hardness, clarity, and hydrophobic properties that come at the cost of durability. They'll take a heavy impact unlike glass, but it means they have a shelf life.