The helmet will probably be stronger with it still left in but the overall look of the helmet, IMHO, will be horrible. The visor will be skewed and stick out more than it should and not uniform across the face. And you will be cutting down on your field of vision by more than 50%...(probably more) You will have about the same line of sight as a stormtropper ie. not being able to se where or into what you are walking. small kids, stairs, shrubberies.