Nanoparticles and Near Infrared Vision

Last month an article was published in Cell describing how researchers had injected the retinas of mice with nanoparticles that attached to retinal photoreceptor cells and changed near-infrared light (IR) to green light the animals could see in the dark. Like a mouse version of night vision goggles without the goggles.

To see if the treated mice could actually see in the IR range (700 nanometers to 1 millimeter), they checked the pupils of the injected mice and noted that the test animals' eyes constricted when shown 900 nm light, while the controls (not treated) mice did not.  

Then, researchers gave the mice a choice of two boxes: one that was completely dark and one illuminated by near-infrared light. Control mice spent time in both boxes, but mice with nanoparticle treated retinas chose the dark box, suggesting that they could see the near-IR light and preferred the dark. 

This research has tons of applications. All of which are fascinating. I plan to keep an eye on developments in mammalian night vision. Who knows? Maybe someday everyone will have excellent night vision and no one will stub a toe in the dark. Go science!

Speedy Bee Vision

The early bird gets the worm could be changed to the quick bee gets the pollen. Recent research has discovered that the photoreceptors in bees' eyes can detect black and white images about 4-5x faster than humans. They can see color 3-4x faster than humans. 

What good is visual speed? Scientists believe vision is important in bees' ability to find flowers and pollen. The high-speed vision might help bees keep track of color in flickering light (e.g., when flying quickly through bushes).

"The scene for the bee would be flickering with different amounts of light and shade, and the color view is potentially changing, from a flower reflecting more light to less light," said study author Peter Skorupski, a researcher at Queen Mary, University of London, in England. Fast color vision could help bees accurately perceive color during flight.

So the next time you bend to sniff a flower and encounter a bee, realize he probably saw you first. Relax and let him go about his pollen collecting business. Go science!