By doing so, they could measure each shark's field of vision.
BBC: Earth News - Hammerhead shark mystery solved
In sharks with a usual head, such as the lemon shark (Negaprion brevirostris), the field of vision of each eye overlaps by just 10 degrees.
Lunn said the device puts a controlled electronic field into the water, which dissipates quickly, so there is no permanent damage to the shark.
CNN: Divers embrace anti-shark device
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