A:AnswerYes you can. Per the instructions:
Prescription Lens Compatible
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They just pop out and pop in
A:AnswerYou do not have to. Razer has partnered with Lensabl to offer 15% off premium replacement prescription lenses, however, you can use other lenses.
A:AnswerI don’t think your gonna be able to hear at the level your probably looking for. In a loud casino it cuts the sound probably by 1/2 which is ok. But if you add wind I don’t think your gonna get much sound sadly.