Shirou
京平
It is a compromise. You get less light into your eyes, after a few minutes your eyes compensate and you have less chance of becoming {I cannot find the proper word} temporarily blind because of the incoming cars headlights. Here some idiots are used to replace incandescent bulbs with xenons directly, not modifying the optics, they flood the street with light.It's not worth the risk to ride at night with the poor visibility these tinted visors have.
Look after yourself.