My daughter has a significant enough glasses rx that without her glasses, she just sees blobs. She's made to with seeing blobs going to the pool, but we were planning on having her try snorkeling. Not only was the purchase process and upload of her rx easy, but the order processing was lightning quick and we had the new mask in no time at all! It made for a great new adventure for her, and she saw all sorts of fish on our trip - thanks GetWetStore!