visor
nounmasculine/viˈzoɾ/medium
vi·sor
Definition
A device that protects the eyes and allows seeing, such as the transparent part of a helmet; also, the small screen on a camera for framing the image.
He flipped down the sun visor in the car.
Look through the camera's viewfinder to focus.
Etymology
Do latim 'visor, -oris'.