These glasses had a blue lens on
the right eye and a red one on the
left eye. The blue lens only let blue
light in. The red lens only let red
light in. People’s brains combined
what their eyes saw separately. This
produced the illusion of 3D imagery.
Using the red and blue filters caused
color issues in 3D movies. Today
3D movies are shot using polarized
light. Movies are still shot through
two different filters. But instead
of using color, they use different
wavelengths of light. Moviegoers
wear polarized 3D glasses to see
3D effects.
4D
A film screening that
combines a 3D movie
with physical effects like
wind, rain, smells, and
vibrations.
• Most movies are 2D,
appearing flat.
• Special 3D glasses have
one blue lens and one red
lens.
• Polarized 3D glasses have
lenses that filter different
wavelengths of light.
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