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Posts tagged retina

February 27, 2018


In Ancient Egypt, one story was that cats' eyes always reflected the sun and that's why they glowed at night.

Why Do Cats’ Eyes Glow At Night?

Cats and many other nocturnal animals have a part of their eye called the tapetum lucidum.

August 9, 2017


Do you see diamonds or squares?

The Difference Between A Square And A Diamond

Perception is more than just how things are literally viewed.

March 29, 2017



Why Red Eye?

Learn why you sometimes have glowing red eyes in photographs.

October 20, 2016


Y You will continue to see a faint glow of light -- even though nothing is there.


If you look at a bright lamp and then close your eyes, why can you still see the light?

July 20, 2016


Rubbing your eyes can cause illusions of light and patches of color

The Amazing Flash Illusion

If you've ever rubbed your eyes and seen faint sparkles of light, you have demonstrated a surprising fact of sensory physiology.

June 3, 2016



The Green Door

We don't perceive color in our peripheral vision because we have no cones, which sense light frequencies, on the outer edge of our retina.

July 14, 2015


contact lens

Making Contact 

Contact lenses bring objects into closer and clearer focus than glasses.

February 1, 2013


Has this "illusion" ever happened to you?

Blue Sky + Looking Up = Seeing Tiny Dots And Swirls

Have you ever been staring into space, or gazing up at a clear, blue sky and suddenly noticed clusters of tiny dots and swirls?

May 9, 2012


Check out his eyes... not his antlers!

Reindeer Have Ultraviolet Vision

Scientists tested eighteen reindeer with light, and found that their eyes responded to both visible light and ultraviolet.

January 27, 2012



The Blurry World Underwater

Why can't we landlubbers focus underwater without goggles?

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