Okay, so I really need new glasses. The problem with the glasses I have now is : the lenses aren't working for my eyesight anymore and my glasses are worn out and broken because I've been using the same ones for 2 years. My mom doesn't believe me and I really need glasses. The ones I have are pretty much useless for me to use and I can't even see medium sized font 3 feet away from it. So, how do I convince my mom to let me order new glasses? The glasses I want are Ray-Ban RX 5121, by the way.