The only drawback that I do not even know if that is ever on the glasses ('m not a professional), if it's too bright out there yet, it flickers in the corner of my eye. It's frustrating! But also because there is finally a remedy. Simply the shutters go down a piece of .......
PS: Since the writing of such reviews is to serve the interested parties to have to get some independent additional information about the product, the author is investing time and effort, your feedback on the button would be helpful or not motivation for the author, in the future his experience to others to. Thank you in advance !!