How cats' eyes keep the world in focus

SLIT pupils are found in species ranging from the Nile crocodile to the domestic cat. They allow nocturnal animals to squint tightly in bright daylight to block out light that could harm their sensitive retinas. Now Tim Malmström and Ronald Kröger at Lund University in Sweden think they may also have evolved to exploit another optical trick – the multifocal lens. Such lenses have multiple concentric focal zones,
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