But before worrying about the mote in a distant polluter's eye, it makes sense to consider the beam in thine own.

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As long as there is a birds-eye view from one building to the next, the laser beam can transmit to and from a high-speed transmission center.

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The liquid acts as an additional lens, narrowing the beam of light just as a telescope turns what looks to the naked eye like a smudge on the horizon into a crisp image.

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When a beam of light is focused by the cornea and the lens, at the front of the eye, on to the retina, at the back, it stimulates photosensitive cells known as rods and cones.

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