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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Sometimes it's hard to see the light.

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Especially if it lies outside the visible spectrum, like x-rays or ultraviolet radiation.

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But if you long to see the unseeable, you might be interested to hear that under certain conditions people can catch a glimpse of usually invisible infrared light.

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That's according to a study in the Proceedings of the National Academy of Sciences.

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Our eyes are sensitive to elementary particles called photons that have sufficient energy to excite light-sensitive receptor proteins in our retinas.

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The photons in infrared radiation on the other hand have less oomph.

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We can detect those lower energy photons using what are sometimes called night-vision cameras or goggles.

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But the naked eye is usually blind to infrared radiation.

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But recently researchers in a laser lab noticed that they sometimes saw flashes of light while working with devices that emitted brief infrared pulses.

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So they filled a test tube with retinal cells and zapped it with their lasers.

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When the light pulses rapidly enough, the receptors can get hit with two photons at the same time which supplies enough energy to excite the receptor.

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That double dose makes the infrared visible.

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One application of the finding is that it could give doctors a new tool to diagnose diseases of the retina.

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So they could eyeball trouble before it might otherwise be seen.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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