I’m no expert, but if he was fine with you checking his phone and didn’t seem protective of it, then maybe he was telling the truth and didn’t have anything to hide. Either way, now he knows you don’t like it and if he wants to keep you happy he won’t do it again (I would still keep an eye on him). And as a Catholic, I can tell you that I don’t think lying about glasses is a serious concern. Everyone lies and his lie about his glasses doesn’t sound like it was intended to cause harm or anything like that. Anyway, thats just my thoughts.