Three photoelectric cells in the mirror detect light from the front, the rear and overhead.
They seem to play a major role in setting biological clocks, he said, by detecting blue light.
Crystals were also developed to detect both white and ultraviolet light.
Instead, they are used to detect light in the Earth's atmosphere that is caused by incoming gamma rays.
Two types of cells in the eye detect light - the cones and the rods.
Some species have been shown to be able to detect ultraviolet light.
Solar telescopes usually detect light with wavelengths in, or not far outside, the visible spectrum.
Most organisms with color vision are able to detect ultraviolet light.
And even then, the sensors would only be detecting light that was already an hour old.
Several fish and many birds can detect ultraviolet light, an it probably helps them to navigate.
Brown eyes are organs that detect light and have brown-pigmented irides.
The simplest photoreceptors can do no more than detect light or not detect it.
Current systems usually use photosensors mounted in the actual rear-view mirror to detect light and dim the mirror by means of electrochromism.
Mr. Gelfand is legally blind, but can detect light and dark with a blurriness he describes as "an Impressionist painting left out in the rain."
Eyes are organs that detect light and convert it into electro-chemical impulses in neurons.
Ammocoetes have a pigmented eye spot located in the head, that can detect light and dark.
The actors see a whiteness but can detect light and dark somewhat.
The nerve cells in the retina detect light and send signals to the brain about what the eye sees.
Most nemerteans have various chemoreceptors, and on their heads some species have a number of pigment-cup ocelli, which can detect light but not form an image.
On their head some species have a number of pigment-cup ocelli, which can detect light but not form an image.