Let me tell you: The Fresnel lens I stuck on back window pays back big time. It lets you see virtually everything going on behind you.
I even cut a 4 by 8 inch sized lens in "half" and stuck the lower part "upside down" on upper rim of windshield just in front of sun visor.
And no bending neck anymore to see trafic light change.
You have to cut and stick the lens this way, because the center of the lens is not centered on the plastic sheet. It's "off" center to allow you a wider angle of view to see things towards the ground. The sheet has "TOP" printed on it.
So if you stick it upside down on your windshield (of course NOT obstructing your eye-level view) the benefit is in the angled view UP, where the trafif lights is. Tadaa!
JCJ
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