3D LENS WITH REDUCED BACK REFLECTANCE

An optical interference coating with reduced back reflectance for 3D glasses based on colour separation has a substantial transmittance at one or more passbands over the visible spectral range in order to view the desired left (right) eye image and a substantial reflectance and absorption at one or more different blocking bands over the visible spectral range in order to block the undesired right (left) eye image while simultaneously reducing the back reflectance of visible light, whatever the source, towards the viewer's eye. The thickness of the absorbing layer material or materials are chosen such that the luminance back reflectance of the coatings is substantially reduced while minimizing the transmittance loss of the filter's desired passbands. The optical interference coating is typically deposited on the concave side of the lens for 3D glasses. The thicknesses and materials are chosen such that the left eye reduced back reflectance 3D coated lens transmits the desired left eye image and blocks the right eye image while right eye reduced back reflectance 3D coated lens transmits the desired right eye image and blocks the left eye image so that a 3D image can be viewed whilst substantially reducing distracting back reflections from the reduced back reflectance 3D coated lenses.