The Nearsightedness Epidemic

  • Опубликовано: 30 дек 2015
  • While not the kind of epidemic you're used to hearing about, nearsightedness is becoming a major health issue in many places. Learn about how scientists are finding out the reasons behind the increase in myopia, and how sunlight might be an important component.
    Hosted by: Michael Aranda
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    Sources: (pp 18-20)
  • Длительность: 8:59
  • SciShow  science  Hank  Green  Michael Aranda  Myopia  Blindness  Epidemic  Sunlight  Sports  Preventive Medicine  Eyeball  Optics  Education  What causes nearsightedness?  nearsightedness  The Nearsightedness Epidemic  Near-Work  High Myopia  East Asia  First-born  

Комментарии: 3 429

  • Bob Rombos
    Bob Rombos 9 часов назад

    I have 20/20 vision and sit in front of a screen almost 24/7

  • SamuraiPenguinStudio
    SamuraiPenguinStudio 9 часов назад

    I would postulate that going outside also comes with being forced to use far-sighted focus a lot more on top of things like sunlight.  After all, when you're outside, your eyes can't help but put focus on things ten, twenty, or hundreds of meters away.  (And I'm not the only comment that shares this sentiment).   The eyes have muscles.  And as the term goes for body functions:  "Use it or lose it."

  • trent humphrey
    trent humphrey 2 дня назад

    One of your guys best videos yet. Great job.

  • Atom Odyssey
    Atom Odyssey 3 дня назад

    I'm near sighted, so is my father and mother, but my brother isn't, I always went outside more than him as a child, and I got the eye troubles, wtf world

  • Elizabeth Ann
    Elizabeth Ann 3 дня назад

    *Too bad there’s no recess in middle or high school.*

  • Elizabeth Ann
    Elizabeth Ann 3 дня назад

    If someone already has myopia is there any evidence saying that more sunlight per day could help treat it/ slow it’s progression?

  • TragestyX
    TragestyX 3 дня назад

    I just recently developed Myopia. I'm hoping it's temporary. I wish I logged down exactly when it first started. Can't tell if it's a week or 2 weeks.

  • IntarwebUser
    IntarwebUser 3 дня назад

    So what we need are sun rooms to do our homework in.

  • Emily Matheny
    Emily Matheny 3 дня назад

    So basically math makes us nearsighted?

  • Ashlee Knowlton
    Ashlee Knowlton 3 дня назад

    Yes! Yes! And yes some more! I didn't have a problem with nearsightedness until I started spending more time inside. I've been saying for years fluorescent lighting makes my eyes tired. If I'm inside a lot like when I worked in a Sam's Club I had to wear my glasses and go outside to give them a break so I could see clearly.
    I have almost 2020 vision and sometimes I can't see the words in front of my face!
    I have a very slight astigmatism. I could never explain why it seems like my vision would go through phases. Because sometimes it was better than others and then I realized that fluorescent lighting was affecting me negatively and I actually needed sunlight.

  • LeFlavius_NL
    LeFlavius_NL 3 дня назад

    in other words

  • Video Gamer
    Video Gamer 4 дня назад

    What is this thing you call "outside?"
    Is it a disorder or something? Is it a new gender?

  • Daniel Prince
    Daniel Prince 4 дня назад

    This can explain the fact for why my far sight vision improves when I am out playing sports in the bright sunny day.

  • mechadense
    mechadense 4 дня назад

    A major problem is that there are still no sunlight readable general purpouse screens available.
    (not counting ultraslow black and white e-paper or ultabright active displays that massively waste energy). Sadly mirasols IMOD technology seems to not have made it. It seems the average buyer just goes for the most brilliant colors.

  • IonIsFalling7217
    IonIsFalling7217 5 дней назад

    I am an oldest child and myopic, but I spent PLENTY of time outside.

  • Etrinix IU
    Etrinix IU 6 дней назад

    Soo... Artificial light is the cause? Go figures

  • Everyday is a loop of ctrl c and ctrl v

    My older brother, the first born of my family, has glasses, but he's okay without them. Me, the second child, needs glasses badly. With my glasses off, I can barely see 3 inches in front of me.

  • Calla Schiefelbein
    Calla Schiefelbein 7 дней назад

    Who else went outside after watching this video?

  • memo a
    memo a 7 дней назад

    Maybe pollution is the cause like China ?!

  • Jessica Pinto
    Jessica Pinto 8 дней назад

    I went sailing one day and was the spotter, meaning I had to spot the buoys for us to navigate, which were far away, so I was always looking at the distance. I noticed when riding my bike home, I saw the surroundings a little clearer.
    The sun wasn't shining that day. Can we train our eyes to focus by looking at the distance?

    • Jessica Pinto
      Jessica Pinto 8 дней назад

      I was also terribly nearsighted while having played outside every day. I got contacts when I was 11 because with just glasses my miopia would worsen by 1 point every year, with my contacts it only went up (or down?) 3 points in 16 years.

  • Sandra Hawkins
    Sandra Hawkins 9 дней назад

    I'm farsighted

  • Yakarot Sennin
    Yakarot Sennin 10 дней назад

    But, IS IT TOO LATE TO GET BACK TO 20/20 vision!??

  • markmeasinner
    markmeasinner 10 дней назад

    I’d be interested to know the age of onset of myopia, since I was barely 7 when I started wearing glasses. Of course my father’s also nearsighted so... then again I was also a lonely indoorsy child... data inconclusive

  • Taco Tom
    Taco Tom 10 дней назад

    8:02 If the effect is from playing sports, I need glasses NOW

  • Linda Durning
    Linda Durning 11 дней назад +1

    Can you die from too much water? Yes moron it’s called drowning

  • with a side of fries
    with a side of fries 11 дней назад +1

    I'm in a sport where you stay Inside so it eliminates other variables like wind btw I'm in archery

  • Mars_Anze
    Mars_Anze 12 дней назад

    What's a sun? And what's the name of the "outside" server?

  • Morgan F
    Morgan F 14 дней назад

    *stares nervously at closed blinds*

  • Nissan Altima
    Nissan Altima 15 дней назад


  • Matthew Farrelly
    Matthew Farrelly 16 дней назад

    The smart people have glasses stereotype apparently now has some backing to it lmao

  • Pablo E
    Pablo E 18 дней назад

    Another option is using high lumen LED light bulbs in your home that have the same intensity as sun or brighter.

  • Duchesse de Berne
    Duchesse de Berne 19 дней назад

    This explains Gollum

  • Caylan Alexander
    Caylan Alexander 19 дней назад

    My old eye doctor said I had this, made me wear an eyepatch, and later said that I didn't have a problems with my eyes to begin with. Now I'm legally blind smh

  • mitzapper2
    mitzapper2 22 дня назад

    So people with glasses ARE smart!!

  • zammmerjammer
    zammmerjammer 23 дня назад

    How does this sunlight hypothesis relate to populations at different latitudes? Shouldn't we expect those closer to the poles to have more near/far-sighted people?

  • Abla Malaba
    Abla Malaba 23 дня назад

    I wish the presenters would moderate their speaking volume so I don't have to turn the volume up or down.

  • Jeffrey Bull
    Jeffrey Bull 23 дня назад

    Is this guy wearing contacts?

  • Collin Klitz
    Collin Klitz 23 дня назад

    It also helps with depression

  • Lexie Jaffas
    Lexie Jaffas 25 дней назад

    To little to late. I wish I would have known about this before I became near-sighted

  • Seth Begley
    Seth Begley 25 дней назад

    If you tell us these things, we won't watch your videos, cuz we won't be on electronics.

  • DeadLeaFMoth
    DeadLeaFMoth 26 дней назад

    So you're telling me I need to get out more?

  • Perplexion Dangerman
    Perplexion Dangerman 27 дней назад

    What the hell is that beeping ?  I have headphones on full volume and I can hear it.

  • Valerie Pallaoro
    Valerie Pallaoro 28 дней назад

    There's an old trick that you go outside and focus on the distance; try to bring it into focus. I'd assume it is like exercise for your eyes. So, outside, yes, in the sun, yes. But not necessarily because of the sun. If you get me.

  • Calvin IDK
    Calvin IDK 29 дней назад

    Well guess my kid is gonna​ be blind

  • Keep Calm and Call for Fire
    Keep Calm and Call for Fire 29 дней назад

    Well, I escaped the evil clutches of nearsightedness, and fell right into the hands of astigmatism. Admittedly, I'm pretty sure I've always had it.
    I also played outside growing up, and have worked outdoors since I was 16.

  • FriedEggSandwich
    FriedEggSandwich Месяц назад

    I'm very near-sighted (-7), and was the first child. But I hated studying, didn't really enjoy reading (because I was forced to) and am terrible at maths. I also spent a lot of time outside, although we don't have the strongest sunshine in the uk. My mum is more near-sighted than I am, and my younger brother and sister much less near-sighted (my brother is -0.25 or something), but they didn't spend any more time outside than I did. My sister probably spent less time outside, and did more reading, but has much better sight than I do.

  • Andrew Baumann
    Andrew Baumann Месяц назад

    At the age of 13 (respectively as we are 2 years apart) me and my brother had 20/13 vision. In the following 5 years between 13 and 18 I played soccer, did marching band, and played football. All of which were outside a majority of the time. My brother on the other hand did gymnastics and hockey, both inside. I retained my 20/13 vision, while my brother is now at about 20/60 and requires glasses. Granted this is not a large study, but interesting non the less.

  • The Siberian Husky
    The Siberian Husky Месяц назад +1

    I used to stare at the sun when I was kid. I think that's the cause or because of technology?

  • Ian
    Ian Месяц назад

    I was born nearsighted

  • ARC strider
    ARC strider Месяц назад

    The manner in which this video was presented is really top drawer. Great work.

  • Bill Cipher
    Bill Cipher Месяц назад

    i started loosing my vision in kindergarten and soon was legaly blind
    i am now in high school and my vision is so bad that i can't see past an half a foot in front of me without stuff going blurry. and it is slowly getting worse
    good thing glasses are a thing because without them i would be a blind person that can see color
    and i am one the smartest person in my family so maybe there is a coralation

  • tiki torch
    tiki torch Месяц назад

    The Eloi didn't need glasses, but the Morlocks did?

  • Pyrochazm
    Pyrochazm Месяц назад

    Well this would explain my excellent vision. I'm outside all the time and I'm a dumbass. Fair trade.

  • Cale Hatfield
    Cale Hatfield Месяц назад

    Can sunlight make my vision more clear or does it only work for people as of yet unaffected?

  • Deinonychus194
    Deinonychus194 Месяц назад

    So the parents at the Chinese schools were told to let their kids go outside more but they didn't seem to do that, that means; are the parents to blame for all this?

  • Meganite03
    Meganite03 Месяц назад

    Is geocaching a sport? What about going to the beach?

  • OutrunTheWolves
    OutrunTheWolves Месяц назад

    Ayy guys I have near sightedness and I didn't know, this vid helped considering now I don't feel as weird. And oh btw I'm a first child :)

  • Beasun
    Beasun Месяц назад

    *stares at the sun to fix eyes*

  • Chris Mills
    Chris Mills Месяц назад

    How do you give chicks eye tests?

  • G Blake
    G Blake Месяц назад

    I'll take my nearsightedness. I hate outside and sun.

  • Arenavi TM
    Arenavi TM Месяц назад

    Would taking large doses of Vitamin D help? I used to be perscribed 50,000mcg of it for depression but it didn't do much for me. I stll have it laying around and am curious to know if it would help my nearsightedness.

  • Vdbcorten86
    Vdbcorten86 Месяц назад

    Is it possible that it's actually caused by Greenhouse gasses most asian country have more of those too

  • Kristin Krohn Henriksen
    Kristin Krohn Henriksen Месяц назад

    I am nearsighted and longsighted how is that possible?

  • Katie SJG
    Katie SJG Месяц назад

    i thought the title was "The Nerdsightedness Epidemic"

  • Geoff Hiemy
    Geoff Hiemy Месяц назад

    When I went to China I saw that some parents hang some sort of clip from the ceiling above a desk so that it can clip to the kids hair and stop them bending over their homework

  • Bleeding Rose
    Bleeding Rose Месяц назад

    well now i know why im near sighted

  • Lich King
    Lich King Месяц назад

    Now tell this to my parents

  • Shiva Rampersaud
    Shiva Rampersaud Месяц назад

    What's "outside"? And I'm pretty sure "sun" is a DLC

  • Levi Strauss
    Levi Strauss Месяц назад

    I've just had terrible vision since I was born

  • Tom Hadler
    Tom Hadler Месяц назад +1

    Awful research by pseudoscientists by the sounds of it. Why are the assuming it's sunlight rather than just simple being outside means focusing on things further away, thus training the eye to change focus from bear to far objects. Ridiculous conclusion, especially the way it was presented here.

  • Kylie Wang
    Kylie Wang Месяц назад

    went outside as a child. parents had to force me inside after it got dark. still needs glasses...

  • Casey Pearce
    Casey Pearce Месяц назад

    I wasn't the best student in school , I was always outside, my brother and I grew up on a river. My brother was a advanced student and has 2020 vison and hated the out doors me on the other hand love the outdoors have 20/400 so was gives (sorry about my bad grammar)

  • ToastyInspiration™
    ToastyInspiration™ Месяц назад

    I blame dragon ball for making me near sighted xD

  • Moe A.
    Moe A. Месяц назад +1

    So to heal my nearsightedness I just need to go outside and stare at the sun?

  • Jay Perrin
    Jay Perrin Месяц назад

    Kids as young as 10 spend hours doing homework? They do that in the US too but that's way too much for kids.

  • pbilk1
    pbilk1 Месяц назад

    I have been outside a lot as a child I doubt that is my cause.

  • justin43i4
    justin43i4 Месяц назад

    any video not hosted by hank is getting a thumbs down (:

  • TechJunkie
    TechJunkie Месяц назад

    It's the use of far sighted focusing. boom!

  • WinterCraft
    WinterCraft Месяц назад

    Maybe all this could have been prevented if we all went to bed when the sun went down.. I think with the use of fake lights and stuff it messes up our body.
    Has anyone done a study on that? I remember going to bed at 8:30pm every night when I was going to primary school.

    JIA LINN Месяц назад

    my brother has his masters and has perfect eyesight..I dont have two years in college and I cannot see well. Its not education. My brothers and I spent the same time indoors and out

  • Bonaventure Duprat
    Bonaventure Duprat 2 месяца назад

    Is is possible that sunlight and outdoor activities reduce stress and the stress is what causes the eye problems?

  • Kwandaioha O.o
    Kwandaioha O.o 2 месяца назад

    I guess I'm the exception XD I'm from Florida and my parents had me in preschool from age 2 and piano lessons from age four. I read a lot. Like hours a day. My parents didn't let me watch much TV. I did spend a lot of time outside though especially in summer working on relatives farms. I'm not near sighted but I've been severely far sighted since I was 9. I'm so far sighted I need glasses all the time and even when driving.

  • KendrixTermina
    KendrixTermina 2 месяца назад

    I did always wonder how the hell all those ppl with bay eyesight lived in ancient times if they couldn't hunt or gather very well. Turns out it was just less common.
    The obvious cheat would be to read or study outside or in a room with huge windows, like a screened porch.

  • KendrixTermina
    KendrixTermina 2 месяца назад

    So the "nerd or bookworm with glasses" stereotype might be related to ppl with such interests spending more time inside
    ...actually my siblings are all near-sighted bar one (probs genetic reasons, half our father's family wears glasses), and the strenght of our glasses does seem roughly proportional to the level of indoorsy-ness. This, at least, bodes well for our somewhat outdoorsy youngest sister, she might not need thicker glasses as quickly as the rest of us XD

  • Marilla B
    Marilla B 2 месяца назад

    Our myopic ancestors were eaten, killed or involved in deadly accidents and were unable to pass on their myopic genes. Now that is not the rule and therefore more and more myopics are passing on their myopic genes.

  • Amy Hudson
    Amy Hudson 2 месяца назад

    Huh, dopamine.
    So I have near-sightedness because I'm depressed?

  • Andrew Cady
    Andrew Cady 2 месяца назад

    Or we could use those bright lights that they used on the chickens to light our indoor spaces.

  • Chrisly3ear
    Chrisly3ear 2 месяца назад

    Well it could also be the case, that if you're outside, you'll "flex your eye's muscles" more than while being inside. If you're outside there are a lot more different distances your eyes need to switch focus between. If you're inside, well, not so much.
    (I'm at 5:46 in the video. Maybe this will be brought up.)

  • champnewt
    champnewt 2 месяца назад

    Spent all my time outside as a kid. By third grade I needed glasses.

  • GambyThe4th
    GambyThe4th 2 месяца назад

    I'm 19 years old and in college with near-sightedness. I was diagnosed with it in 3rd grade and I was a pretty active kid. The weird thing about it is that all 3 of my siblings aren't near-sighted: and I was more active than all of them. Since my mom is near-sighted, I think genetics does contribute to this epidemic one way or another. I could just be miraculously unlucky but it's just too uncanny of a coincidence.

  • Susan Farley
    Susan Farley 2 месяца назад

    Played outside all the time when i was a kid. My mom told me i had to come in when the street lights came on. Ended up nearsighted anyway.

  • Rob Delgado
    Rob Delgado 2 месяца назад

    its from reading maybe? were so brainwashed into just looking down at words on a page when we should be looking up and out into the universe, this is where we will find the answers not looking down we have to look out.

  • Michael Meissner
    Michael Meissner 2 месяца назад

    Question: can myopia be reversed to any degree without surgery? My eyesight is somewhere around 20/400 (-5.00 and -5.25 with my contacts), and I know that my brother, who had a far worse prescription, was successfully corrected to about 20/25 with surgery. So surgery certainly is an option for me, but it would be really cool if it can be corrected even to a slight degree by natural conditioning.

  • springxdeerling pkmn
    springxdeerling pkmn 2 месяца назад +1

    Damn he cute

  • Errol Candelaria
    Errol Candelaria 2 месяца назад

    His voice is so relaxing 😴

  • Matt Parker
    Matt Parker 2 месяца назад

    I'm an elementary science teacher. I'm going to add this information to the list of reasons I am pushing for my school to build an outdoor classroom.

  • Genoch Tuason
    Genoch Tuason 2 месяца назад

    basically useless vid,

  • Blacksquareable
    Blacksquareable 2 месяца назад

    Alliance Optikk actually look at this phenomenon on their Facebook site. They are very much mainstream and quote, "too much reading and close screen-work tires the eyes and can lead to shortsightedness." That's official.

  • GusGus
    GusGus 2 месяца назад

    You look like Mike Shinoda

  • Seth Biggs
    Seth Biggs 2 месяца назад

    So glasses do mean you are smart