vision

Humans Have Been Able To Perceive Infrared Light This Whole Time 

The human eye is a more complex and mysterious thing than we thought. Recently, a group of scientists were puzzled by flashes of green light they saw from an infrared laser, whose light should have been far outside the visible spectrum. Like scientists do, they investigated. Human eyes do indeed perceive infrared light, they found, but not they same way they perceive ordinary colours. It’s weirder than that.


Contact Lenses Used To Be Made Out Of Glass

Did you know that before the age of plastic, contact lenses were made of glass? It’s true! And slightly horrifying!


Why Are Stars Star-Shaped?

Our sun is spherical, so why is it that other stars look… star-shaped in the night sky? Actually, it’s all down to the quirks of light and your (imperfect) eyes.


The Man Who Grew Eyes From Scratch

Growing nerve tissue and organs is a sci-fi dream. Moheb Costandi met the pioneering researcher who grew eyes and brain cells.


Why Deer Freeze In Your Headlights

Less a function of fear than bewilderment; simply put, deer freeze in headlights because they can’t see.


How Many Different Colours Can We See?

We all know that some people see the world in a limited palette of hues due to colourblindness. But what’s the largest number of colours that we can possibly see?


How Far Could Legolas Really See?

In Lord of the Rings, Legolas claims to be able to count the exact number of horsemen five leagues away — that’s over 27km — even discerning their leader as very tall. But would that ever be possible?


Not Everyone Sees The Same Colour When They Stare At This Spinning Disk

The spinning disk below is a little seizure-inducing, but it’s a lot of fun because not everyone sees the same colour when it spins. Some people see green, others see yellow, a few see red, while some see no colour at all.


A Praying Mantis Wearing Tiny 3D Glasses For 'Scientific Research'

You may have thrown your 3D glasses away a long while back, but not this little critter. After all, this praying mantis has had his glued to his face by scientists in the name of “research”.


Do Colour Blind People See More Colours When They Take Hallucinogens?

If you gave a colour blind person something like LSD or some other sort of hallucinogenic drug, would they see colours they couldn’t before? Interestingly, there is a great deal of crossover in how people affected by protanopia (red light dichromacy) and deuteranopia (green light dichromacy) see the world, as such “red/green colour blindness” is often used as a catchall term. As a side note, this is also by far the most common kind of CVD.