This question doesn't pertain to scratching the screen or anything. I want to know how durable the screen is to cracks. What I mean is sometimes I hold the iPad with a little too much pressure when I'm walking around the house with it and I'm worried that if I continue it that the screen will crack. And also when I press down sometimes with a lot of pressure (not on purpose) I sometimes have a little rainbow streak. It literally goes away when I remove my finger but I'm worried that I have done damage to my iPad