Eye vs. camera – Michael Mauser


Watch the center of this disk. You are getting sleepy. No, just kidding. I’m not going to hypnotize you. But are you starting
to see colors in the rings? If so, your eyes
are playing tricks on you. The disk was only ever black and white. You see, your eyes don’t always
capture the world as a video camera would. In fact, there are quite
a few differences, owing to the anatomy of your eye and the processing
that takes place in your brain and its outgrowth, the retina. Let’s start with some similarities. Both have lenses to focus light
and sensors to capture it, but even those things behave differently. The lens in a camera moves to stay
focused on an object hurtling towards it, while the one in your eye responds
by changing shape. Most camera lenses are also achromatic, meaning they focus both red
and blue light to the same point. Your eye is different. When red light from an object is in focus,
the blue light is out of focus. So why don’t things look
partially out of focus all the time? To answer that question, we first need to look at how your eye
and the camera capture light: photoreceptors. The light-sensitive surface in a camera
only has one kind of photoreceptor that is evenly distributed
throughout the focusing surface. An array of red, green and blue filters
on top of these photoreceptors causes them to respond selectively to
long, medium and short wavelength light. Your eye’s retinas, on the other hand,
have several types of photoreceptors, usually three for normal light conditions,
and only one type for lowlight, which is why we’re color blind
in the dark. In normal light, unlike the camera,
we have no need for a color filter because our photoreceptors
already respond selectively to different wavelengths of light. Also in contrast to a camera, your photoreceptors
are unevenly distributed, with no receptors for dim light
in the very center. This is why faint stars seem to disappear
when you look directly at them. The center also has very few receptors
that can detect blue light, which is why you don’t notice the blurred
blue image from earlier. However, you still perceive blue there because your brain
fills it in from context. Also, the edges of our retinas
have relatively few receptors for any wavelength light. So our visual acuity
and ability to see color falls off rapidly
from the center of our vision. There is also an area in our eyes
called the blind spot where there are no
photoreceptors of any kind. We don’t notice a lack of vision there because once again,
our brain fills in the gaps. In a very real sense,
we see with our brains, not our eyes. And because our brains,
including the retinas, are so involved in the process, we are susceptible to visual illusions. Here’s another illusion
caused by the eye itself. Does the center of this image
look like it’s jittering around? That’s because your eye actually
jiggles most of the time. If it didn’t, your vision
would eventually shut down because the nerves on the retina
stop responding to a stationary image of constant intensity. And unlike a camera, you briefly stop seeing whenever you make
a larger movement with your eyes. That’s why you can’t see
your own eyes shift as you look from
one to the other in a mirror. Video cameras can
capture details our eyes miss, magnify distant objects and accurately record what they see. But our eyes are remarkably
efficient adaptations, the result of hundreds
of millions of years of coevolution with our brains. And so what if we don’t always see
the world exactly as it is. There’s a certain joy to be found
watching stationary leaves waving on an illusive breeze, and maybe even an evolutionary advantage. But that’s a lesson for another day.

100 thoughts on “Eye vs. camera – Michael Mauser

  1. Imma bet that in a hundred or thousand or million years our eyes will mostly get blind (shocking) or get more and more powerfully and efficient

  2. If people say were so unique,even in twins ate unique and not identical
    So do we see colors not like others?Even colors is unique?

  3. Nice, even though I except different things. But, in addition, I think you forgot the most important thing; camera sees 2D, eye sees 3D. We watch camera records on a flat screen, but we perceive a 180 degrees of environment with our eyes.

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  5. In real life: the pixels are soooooooooooooo tiny like the ants heart but tooooo small and 999999- small

  6. Lol I literally stopped at 4:21 to see if it was just a video of the leaves moving. I swear if you stop it at some point while the leaves are on screen most or all people will see the leaves still moving.

  7. The blind spot in our eye is a bit of poor design. It's here because the optic nerves route above the retina, so there is a hole in it for the nerve to pass through, to reach the brain.
    An octopus' eye has the nerve below the retina, so it doesn't have a blind spot because the nerve can exit the eye without passing through the retina.

  8. I thought they were gonna talk about how the moon looks different from when I look at it vs when I try to take a pic of it

  9. My CAT Decided What I ATE for 24 HOURS (And This Is What Happended…)
    https://chrome.google.com/webstore/detail/threelly-ai-for-youtube/dfohlnjmjiipcppekkbhbabjbnikkibo

  10. Focus on the center of the disk….

    You are getting sleepy

    * immediately looks away*

    Am I the only one who did this?
    Just me?
    Ok….

  11. They did not mention regional light sensitivity. If you look through the window to sunny street you continue to percept detail inside the room which have much smaller amount of light. No one camera can do this.

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