Abstract: A pair of spaced apart parallel arms are provided with backturned clamp hooks on one pair of corresponding ends thereof. The other pair of corresponding arm ends are interconnected by means of a brace extending and secured therebetween. The clamp hook-equipped arm ends may be clampingly engaged with the free swinging longitudinal marginal portion of a vehicle sun visor at points spaced longitudinally along the sun visor and with the remote ends of the arms underlying the sun visor and extending toward the other longitudinal edge thereof. One longitudinal edge portion of a transparent and light-filtering panel has longitudinally spaced portions thereof pivotally supported from the clamp hook-equipped ends of the arms on the sides thereof remote from the backturned clamp hooks for swinging movement of the panel between an extended position disposed at generally 90.degree.