KursanClassic Round Metal Clear Lens Glasses for Women Men Circle Frame Non-Prescription Eyeglasses

Does these blue light blocking glasses help reduce eye fatigue?

I don't need to wear glasses. But can i wear it to protect my eyes from blue light (pc,tv or smartphone etc...)? Would it harm my eyes if i wear them?

What material are the lenses constructed from?

Do these glasses have a prescription in them?