Light shone in from the side, between the two, was guided around each tiny lens, creating a small cloaked region in the centre of each one.
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Lanzmann hid it in a bag with a tiny hole for the lens, and had one of his cameramen point it at an unsuspecting interview subject.
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The cameras have tiny LED lights near the lens to light the area nearby.
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The team started with a commercially available "micro-lens array" - a grid of tiny lenses just 50 millionths of a metre across.
Most imaging systems, such as those found in digital cameras, use a lens to focus a scene on a sensor studded with millions of tiny sensors.
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Inspired by his dentist, Kelman figured out a way to use an ultrasound probe to disintegrate the cataract, a tiny vacuum to pull out the pieces, and a small incision to drop in the new lens.
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