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Posts tagged retina

October 20, 2016


A blue background. A woman in the center of the photograph. Most of her is obscured because of a yellow-orange glow caused by a light leakage.


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

July 20, 2016


Woman rubbing her eyes

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


green door with handle

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


Blue sky with sun reflecting

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



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


man underwater

The Blurry World Underwater

Why can't we landlubbers focus underwater without goggles?

November 24, 2011


siamese cat

Why Are Siamese Cats Cross-Eyed?

Have you ever noticed that Siamese cats are cross-eyed? In fact, that's the only way a Siamese cat can see straight.

November 15, 2011


thaumatrope creation

What Is A Thaumatrope?

Did you know that the thaumatrope was invented by an English physician named J. A. Paris in 1926?

April 6, 2011


statue staring at the sun

Why Do I Sometimes See Tiny Moving Dots?

Those tiny dots are actually blood cells moving in the retina of your eye.

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