My lenses are absolutely made from glass
Cool. The minority are glass but you wisely invested in their superior resistance to scratching and greater optical qualities.
First equation learned in high school physics: F= M x A. M = mass, which we will approximate as weight, I think we agree eyeglasses weigh substantially less than the 650 grams of AVP, but let’s be precise, average weight of glasses is 30 grams, or 21.66 x lighter. A as you know for a freely falling object is equivalent to gravity, 9.8 m/s2, and is constant here. So the force of your glasses hitting the ground is roughly 21.66 x less. To be equivalent you would need to throw them such that their velocity is greater than 212 m/s or roughly 400 miles per hour at time of impact . Which would guarantee you a job as pitcher for your favorite baseball team.
Force as you know is required to shatter a crystalline lattice, ignoring for now glass is actually a liquid it approximates a lattice in our time frame, so not enough force, no shatter.
The shattering coefficient can vary with a number of factors but the force required is linearly related to thickness. Your eye glasses are a couple of mm thick, at least (hope your eyesight isn’t worse), and I think this is a fair approximation because too much thicker and they are too heavy. The thickness of an avp glass is less than 0.4 mm, or 5x less than your eyeglasses.
I think you see where this is going, the much lighter mass and greater thickness of your glasses protects them from simple falls. We can split hairs on some of my assumptions but the result is the same. Fun fact, it’s been calculated if the glass on the iPhone was just 1mm thicker it too would be impervious to falls. Built in failure point? Or calculated risk in the quest for thinness?
Does this answer your question?
Edit: to be honest I’m not sure what point you are trying to make with your questions, that the dbrand case is superfluous? Clearly cases for most of our apple products is a huge market so some people feel the need to put cases on almost anything Apple.
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