(5) No film sunscreening or coloring material that reduces light transmittance to any degree may be applied to the surface of the safety glazing material in a motor vehicle unless it meets the following standards for such material:

(1) A greater degree of light reduction is permitted on all windows and the top six inches of windshields of a vehicle operated by or carrying as a passenger a person who possesses a written verification from a licensed physician that the operator or passenger must be protected from exposure to sunlight for physical or medical reasons.