Spectacles used for viewing 3-Dimensional films have :

Spectacles used for viewing 3-Dimensional (3D) films primarily utilize polaroids (polarizing filters). Modern 3D cinema technology relies on the principle of optical polarization to create a stereoscopic effect. The cinema screen projects two separate images simultaneously, each with a different polarization state—either linear (horizontal and vertical) or circular (left-handed and right-handed) [t2][t4]. The 3D glasses contain polaroid lenses that act as filters; each lens only allows light polarized in a compatible direction to pass through to the eye [t1][t4]. Consequently, each eye sees only the specific image intended for it, and the brain combines these two distinct perspectives into a single three-dimensional image [t4]. While older anaglyph systems used color filters, polaroids are preferred in modern theaters because they maintain color accuracy and provide a superior viewing experience [t2].