Photoreceptors
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Photoreceptor can refer to:

In anatomy/cell biology:

• Photoreceptor cell: a photosensitive cell, most commonly referring to a specialized type of neuron found in the retina of vertebrate eyes that is capable of phototransduction
• Ocellus (invertebrate photoreceptor): a photoreceptor organ ("simple eye") of invertebrates often comprised of a few sensory cells and a single lens
• Eyespot apparatus (microbial photoreceptor): the photoreceptor organelle of a unicellular organism that allows for phototaxis

In biochemistry:

• Photoreceptor protein: a chromoprotein that responds to being exposed to a certain wavelength of light by initiating a signal transduction cascade
• Photopigment: an unstable pigment that undergoes a physical or chemical change upon absorbing a particular wavelength of light; also see
  • Photosynthetic pigment: molecules involved in transducing light into chemical energy

In technology:

• Photodetector or photosensor: a device that detects light by capturing photons

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