A polarizing filter is often placed in front of the camera lens in photography in order to
darken skies, manage reflections, or suppress glare from the surface of lakes or the sea. It’s a filter that only allows light in a certain
direction to pass through. When people are watching a three-dimensional movie,
the audiences need to wear a pair of 3D movie glasses, which is a pair of
polarizers. The
polarization on the glasses, the projected image is two images that are
superimposed on the same screen through an orthogonal polarizing filter. Then
the glasses, which have the same type of filter, allow each eye to see two
individual images on the screen. The polarizing filter
can also filter glare effect, so the idea of this invention is basically to let
the lamp wear glasses to reduce the burden of eye diseases.