Do Brown Eyes See Better?

SciShow is supported by Skillshare. Click on the link in the description to get
two months of unlimited access to over 20,000 classes for free. [ ♪ Intro ] Shades of blue, green, brown, hazel, the world
is filled with a vast array of eye colors. And since these colors are determined by chemical
and structural differences in the eye, it might seem logical that different eye colors
see the world in different ways. But scientists haven’t really found evidence
for that. Other than health risks associated with certain
colors, an eye is an eye. Eye color mostly comes down to how much pigmentation
you have in your iris. Your iris is that colored area surrounding
your pupil the black hole in the center of your eye that lets light in. People with brown eyes have dark irises because
their DNA codes for genes that lead to the production of more melanin, a brownish-black
pigment that absorbs light. While people with lighter eyes produce less
melanin, so more light gets into their eyes hence why they’re more sensitive to
things like fluorescent lighting or the sun. But melanin isn’t the whole story shades of blue and gray are based on the quantity and arrangement of structural fibers like collagen, which scatter light in slightly different ways. But even then, what you ultimately end up
with is different amounts of light entering different colored eyes. So you might think those eye colors see things
differently like, one might have better vision. But the long and short of it is: not really? Studies have generally failed to find significant
differences in seeing ability between eye colors. Although people with lighter colored eyes
may experience more discomfort on a sunny day thanks to that whole more-light-in thing. Some biologists think that may mean they can
see better in dimmer conditions, like when it’s cloudy or at night—but so far, this
hasn’t been conclusively demonstrated. Interestingly, studies have found that people
with darker eyes tend to be worse at perceiving colors, but that might be due to other differences
between the eyes of the people tested, like pupil size. And one weird thing that keeps popping up
is a difference in athletic performance between different eye colors. Several studies in the 70s and 80s suggested
that darker eyes have slightly faster reaction times on the order of 10 to 30 milliseconds. Some found people with darker eyes performed
better at reactive tasks like hitting an oncoming ball or boxing, while those with
lighter eyes were better at non-reactive tasks, like bowling or golf. And that might have something to do with the
amount or quality of light that melanin absorbs. But the most likely hypothesis for this actually
has little to do with eyesight. It’s thought that melanin in the iris correlates
to levels of neuromelanin in the central nervous system a related set of pigments that may
help speed up neuronal signaling. And in general, the studies that found
differences between eye colors tended to have small sample sizes and questionable statistics. More recent replication attempts haven’t
gotten the same results. So it’s hard to say if iris color really
affects vision. And even if it does, most experts think the
effects are really slight. What iris color does impact is eye health,
as lighter eyes are more prone to problems like macular degeneration the failing of
the region of the eye that lets us see objects directly in front of us. And that means people with blue eyes might
want to be a bit more careful about wearing sunglasses and eating lots of leafy green
veggies to keep those macula healthy. But really—those are things we should all
do anyways. So this week, we’ve all been talking about
Skillshare classes we enjoy, and I know I just talked about eyes and vision for this
whole video, but this is the last day of the week and it’s important to remember that sound also matters in video. And luckily, Skillshare has all kinds of classes
on audio recording, mixing, and mastering. No matter what your skill level or what tools
you have access to, there’s most likely a class that will fit your needs. Whether you just want to record a song, or
need to mix vocals with background room tone on your iPhone, or want to start your own
ASMR channel, you’ll learn something on Skillshare. I took this class on Building an Immersive
Soundscape taught by artist and filmmaker L. Ashwyn Corris because I wanted to learn
a little bit more about Audition. And what I liked about that class is that
she approaches it in a hands on way, explaining her technical knowledge but she’s
also talking about how she thinks about using sound creatively to set the tone
of her piece. If you want to check it out, Skillshare is
offering SciShow viewers, and listeners, 2 months of Skillshare for free right now. Just click on the link in the description
to take advantage of this deal and to learn more about sound, or video, or productivity,
or really anything you can imagine! Thanks for watching and thanks to Skillshare
for not only offering our viewers 2 months of free classes, but also for supporting SciShow
and helping us keep our videos free to you always. [ ♪ Outro ]


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