Take some making tape and make a line 1.5 inches on the inside, down from the top of edge of the visor. You now have two clear parts separated by tape. On the upper portion, again on the inside, apply some car window tint using the tape as your guide. Cut the film slightly wider than you need as you can trim it against the masked edge later. Once you've trimmed it to shape, you will have an eyebrow similar to what you see on a car windshield. You can make the job even simpler by using a protractor to draw a line on the outside of the visor which you can then use to line up your masking tape.