I've been using ortho-k lens for a while now and been using KERY for cleaning and storing. My optometrist claims its the only suitable brand for the lens because other brands will leave deposits on the lens. However I feel like he is just making it up because the brand is not as available in other places and he charges quite high prices for them. I want to switch over to another brand and was wondering if its safe. Are there any ingredients I should watch out for in solutions? The one I'm looking to switch to has: borate buffer, HMPC, poloxamer 407, EDTA and polyhexamethylene biguanide. Thanks!=)