Early Vision Development
Human vision began over 540 million years ago. Ancient creatures evolved photoreceptor cells, detecting light and dark, which provided a survival advantage in the primordial seas.
Vertebrate Eyes Form
Around 500 million years ago, the first vertebrates developed more sophisticated eyes. These eyes had lenses, improving focus and enabling better navigation and predator avoidance.
Triassic Period Adaptations
During the Triassic period, mammals evolved a tapetum lucidum, reflecting light through the retina. This adaptation improved night vision, crucial for nocturnal survival.
Color Vision Emergence
Primates, our ancestors, developed trichromatic color vision about 23 million years ago. Unlike other mammals, this allowed them to distinguish ripe fruits and young leaves.
Hunter-Gatherer Eyesight
Humans evolved with eyes positioned at the front of the face, enhancing depth perception. This was vital for hunting and gathering, improving spatial awareness and hand-eye coordination.
Agricultural Revolution Impact
After the Agricultural Revolution, humans began to experience more myopia due to close work and less outdoor activity. Genetic predispositions for myopia became more prevalent.
Modern Vision Problems
Today, excessive screen time leads to digital eye strain. Evolution didn't prepare our eyes for prolonged focus on digital devices, resulting in widespread vision issues.
When did vision development begin?
Over 540 million years ago
Around 500 million years ago
During the Triassic period
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