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Photoreceptor

/ˌfoʊtoʊrɪˈsɛptər/noun
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A photoreceptor is a specialized cell or structure that detects light and converts it into electrical signals, essential for vision in animals and light-responsive behaviors in plants. This term also extends to technology, where it's used in devices like cameras and solar panels to mimic natural light sensing, highlighting its role in both biological and artificial systems.

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The human eye contains about 120 million rod photoreceptors for low-light vision and 6 million cone photoreceptors for color, but the fossil record shows some ancient arthropods had even more complex photoreceptors, like the trilobites with calcite lenses dating back 500 million years.

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