The researchers found that when the frequency of the pulses of infrared retinal cells receive a dou

The researchers found that when the frequency of the pulses of infrared retinal cells receive a double dose of light at this time and the eye can detect light that extends beyond the visible leds spectrum. Data obtained from experiments can be used to stimulate certain retinal areas during diagnostics.
The scientists used a powerful infrared laser. In experiments with laser pulses of different durations, which contained the same number of photons, they found that the shorter the pulse, the more likely that the eye sees it. The photon is absorbed by the retina, which then creates a photopigment, converts light into vision, but usually each photopigments absorb only one photon.
However, if you pack a few photons in one short pulse rapidly pulsing the laser, there is a certain probability leds that one photopigment simultaneously catch two photons and the combined energy of two photons of light activated pigment, and allow the eye to see what is normally invisible. The visible spectrum includes light wave length of 400-720 nm, and if the pigment molecule in the retina simultaneously captures a pair of photons length of 1000 nanometers, the particles of light are delivered the same amount of energy as a 500-nm photon, leds visible in the normal range: so we can see infrared light.
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