Depending on the State, I think having some kind of eye shield is what's needed when driving with the windshield down.
For WA
RCW 46.37.410
Windshields required, exception—Must be unobstructed and equipped with wipers.
(1) All motor vehicles operated on the public highways of this state shall be equipped with a front windshield manufactured of safety glazing materials for use in motor vehicles in accordance with RCW 46.37.430, except, however, on such vehicles not so equipped or where windshields are not in use, the operators of such vehicles shall wear glasses, goggles, or face shields pursuant to RCW 46.37.530(1)(b).
(2) No person shall drive any motor vehicle with any sign, poster, or other nontransparent material upon the front windshield, side wings, or side or rear windows of such vehicle which obstructs the driver's clear view of the highway or any intersecting highway.
(3) The windshield on every motor vehicle shall be equipped with a device for cleaning rain, snow, or other moisture from the windshield, which device shall be so constructed as to be controlled or operated by the driver of the vehicle. After January 1, 1938, it shall be unlawful for any person to operate a new motor vehicle first sold or delivered after that date which is not equipped with such device or devices in good working order capable of cleaning the windshield thereof over two separate arcs, one each on the left and right side of the windshield, each capable of cleaning a surface of not less than one hundred twenty square inches, or other device or devices capable of accomplishing substantially the same result.
(4) Every windshield wiper upon a motor vehicle shall be maintained in good working order.
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