Macro Pupil Constricting in Slow Motion - The Slow Mo Guys

  • Published on Jan 15, 2019
  • British people are not known for great eye contact, but Gav steps up his game by looking deeply into Dan's eyes... From about 2 millimeters away to find out how quickly a pupil constricts.
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    The Speed of Pupil Dilation - The Slow Mo Guys
    Filmed at 1000fps and 500fps with a Phantom Flex 4K
  • EntertainmentEntertainment

Comments • 4 827

  • Lin Sproul
    Lin Sproul 10 hours ago

    you did not need that eye closing sound effect. ew.

  • zunderdog24
    zunderdog24 16 hours ago

    When did they start making Tool music videos?

  • lalalala vie en rose
    lalalala vie en rose 23 hours ago +1

    Thank you for Indonesian subs 😊😊

  • bryan olano
    bryan olano Day ago

    Can I request? Gunshots slow mo please 😊

  • Rolling Rocky360
    Rolling Rocky360 Day ago +2

    Next video: Getting blind in slow motion (696969 FPS)



  • Simona Gogian
    Simona Gogian Day ago

    Quick question, are our pupils a kind of portal to the universe we made up in our mind?

  • Benton Van Duzee

    is he blind yet

  • David Chen
    David Chen Day ago

    3:44 teeeeeeeeeeeheeeeeeeee

  • Steven Haskell
    Steven Haskell 2 days ago

    Ha... do you SEE that ...

  • Param Canada
    Param Canada 2 days ago

    Which camera do you guys use ????

  • Guillermo Ortiz
    Guillermo Ortiz 2 days ago

    I never thought I'd see such a beautiful macro shot. Thanks for sharing it.

  • Ron Samson
    Ron Samson 2 days ago

    Some medical student is going to see this and write a thesis based upon it.

  • Coe T.
    Coe T. 3 days ago +2

    Sauron, is that you?

  • Der Flachii
    Der Flachii 3 days ago

    OMG 🙄 That's creepy

  • Juan Ramirez
    Juan Ramirez 3 days ago

    Cool vid

  • jme3lla
    jme3lla 3 days ago

    I don't know if it has already been done yet, but to raise awareness about germs, and the need to cover ones face, how about a slo-mo video of someone sneezing and coughing...with an actual sick person (I just sneezed on my phone, I didn't think anything came out, but those itty-bitty droplets lit up all over my phone screen said otherwise)

  • filler2013
    filler2013 3 days ago

    I knew someone who could voluntarily change the wideness of his pupils. It was pretty nuts to watch.

  • Youtube Sheriff
    Youtube Sheriff 3 days ago +1

    Our Body is Amazing

  • Ruben Escajeda
    Ruben Escajeda 3 days ago

    I can do that eye thing but I can shake em alot more than that it probably be more noticable

  • Matt Hielscher
    Matt Hielscher 3 days ago

    You're the only person I've seen do that eye shaking thing other than my brother and me!

  • Craig Deegan
    Craig Deegan 3 days ago

    Very cool! More body things, popping a spot? :D

  • MovieGoat
    MovieGoat 4 days ago

    This room looks like the one from Shop lyfter

  • Bob Bil
    Bob Bil 4 days ago

    7:27 somebody touched a my spaget

  • InvictusByzantium
    InvictusByzantium 4 days ago

    The front layer of the iris, the part that looks like it's made of fibers, is called the Stroma and it literally is made of fibrous tissues, almost like a mesh or weave of strands.

  • tjokyla Inc.
    tjokyla Inc. 4 days ago

    ❤Cotton candy In water please!

  • Zac Lee
    Zac Lee 4 days ago

    Been saving up to get the probe lens for a while

  • Skyp DooL
    Skyp DooL 5 days ago

    Пожалуйста, добавьте русские субтитры)))

  • Adrian
    Adrian 5 days ago

    Image stabilization unveiled! 😂

  • Roselyn Small
    Roselyn Small 5 days ago

    That is so cool. I wonder if any optometrists are seeing this and geeking out.

    NAGA SAI 5 days ago

    Amazing .

  • Blender Dumbass
    Blender Dumbass 5 days ago


  • Craig Wall
    Craig Wall 5 days ago

    "That's so gelatinous!" Best. Comment. Ever.

  • Stuff
    Stuff 5 days ago

    Can someone answer this question for me? Why is this video 50fps instead of 60fps? Just curious. I know it doesn't affect the video's quality.

  • Mas Pras Channel
    Mas Pras Channel 6 days ago

    How incredible god make us.

  • Jackson McKenzie
    Jackson McKenzie 6 days ago +1

    This made my eyes watery

  • Sonatine
    Sonatine 6 days ago

    Without a doubt one of the most amazing channels on TVclip!

  • TheCrunchyMoose
    TheCrunchyMoose 6 days ago


  • der rick
    der rick 6 days ago

    superzoom human skin

  • Lainen
    Lainen 6 days ago

    I can do that shake eye thing

  • Chakib Tsouli
    Chakib Tsouli 7 days ago

    Now do a Lasik surgery please!

  • _Young
    _Young 7 days ago

    I felt weird watching this i felt that something was going to happen

  • Teenage Gamer
    Teenage Gamer 8 days ago

    Still not over Dan calling Gavin B.

  • Layout Games
    Layout Games 9 days ago

    3:03 I don't think I ever seen an eye so open that close. xD

  • Beans&Egg
    Beans&Egg 9 days ago

    3:06 - “Resident Evil.”

  • Akash Singh
    Akash Singh 10 days ago

    If you see the iris in the mirror with a flashlight in comolete u will be able to see the dusty textures

    SAAD KHATTAK 10 days ago

    Do a twitching eye macro

    TAVOR VICEROY VALDOR 10 days ago

    Fresh out of pretty blue eyes guys?

  • rohitchaoji
    rohitchaoji 11 days ago

    Wait, I thought vibrating eyes were an anime-exclusive thing.

  • V Lad Gaming
    V Lad Gaming 11 days ago

    It’s amazing how God made humans and so anonymous

  • Samuel Koester
    Samuel Koester 11 days ago

    Try different color eyes to see if they are different from each other

  • Ron Jogo
    Ron Jogo 12 days ago

    Do a slow mo video of setting the bead of a tire with ether and fire

  • andrew murch
    andrew murch 12 days ago

    Wouldn’t mind seeing a block of wood split open with and axe or a block splitter

  • Quinn Jorgensen
    Quinn Jorgensen 12 days ago

    Know I'm scarred great

  • Dimas
    Dimas 13 days ago


  • Brodie Knight
    Brodie Knight 13 days ago

    I think those little strands ARE the muscle fibres, and they're expanding and contracting individually.

  • TreCoolResident
    TreCoolResident 15 days ago

    Just an idea for your slo mo treatment.

  • Egg With Legg
    Egg With Legg 15 days ago

    "How many fingers am i holding up?"
    "One donut"

  • Runehorn
    Runehorn 15 days ago

    Well that was a thing.

  • Anthony Ouellet
    Anthony Ouellet 15 days ago

    Bird box eyes

  • Riley Hollingshead
    Riley Hollingshead 16 days ago

    that was mental needs to be a slow mo guys shirt

  • Robin
    Robin 16 days ago

    Would be cooler with different eye colours !

  • просто кот
    просто кот 16 days ago

    Такие молодые.а уже английский язык знают

  • Joshuaaaaaaaaaaa10
    Joshuaaaaaaaaaaa10 16 days ago +2

    The sound Gav added to Dan's eye closing made me want to throw up

  • vikas agrawal
    vikas agrawal 17 days ago

    You should plug headphones in his ear and play music and then see the eyes.... Very curious to see this reaction

  • Yo Boy Eldert
    Yo Boy Eldert 17 days ago

    You know that when their pupil shrink, they mean serious business

  • Jorge Perez
    Jorge Perez 17 days ago

    Hair waxing would be 'MENTAL'!!!!

  • Dukefazon
    Dukefazon 17 days ago

    That eye shaking experiment was a clever thing with interesting results. Another thing you could try is to turn your head around the axis of your sight, you will find that the eye is moving in weird ways... It makes quick roll movements.

  • Alex Whitton
    Alex Whitton 18 days ago

    So our eyes have optical image stabilization

  • ratzfert
    ratzfert 18 days ago

    Have you ever heard of CFR Kaiser Fleischer ring it's a sign of Wilson disease.

  • Alisa Battaglia
    Alisa Battaglia 19 days ago

    LED is damaging

  • Joelene Merritt
    Joelene Merritt 19 days ago

    I’ve always been interested in how the Eye worked and now I’m horrified

  • Poxteria
    Poxteria 19 days ago

    This made my eyes water

  • Jordan Ezell
    Jordan Ezell 19 days ago

    For balloon June, can you wear a rubber scuba suit fill it with air and water separately and film the suit giggling in slow mo while the wearer dances to set the giggling in motion.

  • The android with sick coin tricks

    if you think about it we're made up of things we see in the universe. Irises are are and have the colors of nebulae, pupils are black holes bc light goes in and don't come out etc.

  • Comment King
    Comment King 20 days ago +2

    The sound of his eye shutting made me cringe so hard

  • IP
    IP 21 day ago +1

    This leads me to our creator. Who created this. "So which of the favors of your Lord would you deny?" - Al Quraan

  • Gavin T
    Gavin T 21 day ago

    Do it again but do you every color of eyes

  • bBrain
    bBrain 21 day ago

    Feel free to do this every 2 weeks with someone new to see different eyes. lol amazing footage

  • Mason Stuart
    Mason Stuart 21 day ago

    Yall should do the water challenge in the cold in slo mo

  • Alexandra Müller
    Alexandra Müller 22 days ago +1

    Please make a high framerate video of grass growing. I'd really like to see it and think a lot of other people will like it as well.

  • neoria
    neoria 22 days ago

    super cool, but i feel like this is disgusting

  • Snow Flake
    Snow Flake 22 days ago

    Your pupil grows up to 55%
    When you see something you love

  • Jon Samuels
    Jon Samuels 22 days ago

    Regardless whatever name u assign, I can’t believe that people still think, as complicated as a plant, animal or human is, that we can’t just be “evolution”/ “a cosmic accident”

  • Travis Bartels
    Travis Bartels 23 days ago

    This video caused me to contemplate life and how crazy it is to be a living being... I got to lay off the reefer.

  • Sean Kratovil-Lavelle
    Sean Kratovil-Lavelle 23 days ago

    The camera looks like a .50 cal.

  • Mostly Confused
    Mostly Confused 23 days ago

    I can only imagine how an Iris as multi-colored as mine would look

  • Nick Pallatt
    Nick Pallatt 23 days ago

    that lens looks like a Darlek eye-stalk

  • Sage Petrich
    Sage Petrich 23 days ago

    It’d be awesome if you guys could do this same concept but trying it stoned and trying it drunk and than compare reaction times would be awesome!

  • REDD
    REDD 23 days ago

    3:17 , WATCH 3:37!!!!!!!

  • logan lobrutto
    logan lobrutto 23 days ago

    So I was looking at my cats eyes and I was wondering if u guys can possibly try to do it with a cat I know this may be hard considering u have to hold the cats head still

  • Campsters2803
    Campsters2803 23 days ago

    This made the news in Chicago land

  • Psyco6
    Psyco6 23 days ago

    That sklorch sound of Dans eye was gross

  • Wendy Tully
    Wendy Tully 24 days ago

    That was fantastic guys!

  • Steven Merrell
    Steven Merrell 24 days ago

    I hope Dan's vision isn't hurt from this haha.

  • BOYD1981
    BOYD1981 25 days ago

    So is Dan a Replicant?

  • AvatardShwag
    AvatardShwag 25 days ago +1

    God the crunching sound when you shut your eye was so visceral

  • Dihler
    Dihler 25 days ago

    iris might be insecure but you still have retinal scans RIGHT?