 red & green (blue) glasses
-the other eye sees the red image, the other sees the green
 polarised glasses
-the images are filtered through lenses polarised in different directions
 mirror apparatus'
-the images are directed to the same apparent spot by mirrors
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 Viewmaster-type equipment
-small slides are magnified and sharpened by appropriate lenses to be viewed from a short distance
 LCD shutter glasses
-the glasses cover each eye in turn very rapidly; the images are swapped on the monitor in the same frequency
 data helmets or glasses
-the images are located into small computer monitors placed very near to the eyes; lenses are used to focus the images
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