Assertion: damselfly's eye | /r/HasAspect | three opsins
Facets:
value: along with uv light
type: OTHER
Source sentences:
text: Human eyes have three opsins—proteins that sense light—giving us a color range of red, green, and blue (one for each opsin).
text: Dragonfly eyes can have four or five opsins, allowing them to perceive the normal color spectrum, along with UV light and the plane of light polarization (the effect you get with polarized sunglasses).