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Human Fovea Detector
- herodotus 11mo agoAmazing - but iPhone screen is too small. Works on my iPad.
- zeckalpha 11mo agoWorked on my iPhone
- intrasight 11mo agoJust zoom in a bit
- dotancohen 11mo agoThat's due to the retina display. Try fovea.
- altairprime 11mo agoWhat’s the correct scale for 210dpi?
- jchw 11mo ago180 worked pretty well on my Framework 16.
- zellyn 11mo agoDitto on my MacBook Air
- avidiax 11mo agoYou can also increase the "lengt". Doubling it works well on my Macbook, and the pattern is more dense so you can see your fovea better.
- zamadatix 11mo agoIt depends on viewing distance as well.
- Arete314159 11mo agoHi, I don't know what this is supposed to do, but I get pretty bad migraines and loading the page made me feel extremely strange almost immediately so I closed it. I would check to make sure this can't trigger migraines or seizures. Maybe it's just me, but also, please double check.
- irilesscent 11mo agoIts supposed to show you how big of a radius your eye can focus on at a time, as we age the radius shrinks. Edit: seems like there isn't enough research to suggest the latter. Apologies
- sho_hn 11mo agoI don't know why you got downvoted. This seems like a very useful contribution.
- krisoft 11mo agoI also don’t think it is downvote worthy. The first part of the comment is very valuable. “I looked at it and it made me feel extremely strange almost immediately“. That is very good to know. The second bit I’m less sure about. What do they mean by “check to make sure this can't trigger migraines or seizures”? Like what check are they expecting? Literature research? Or experiments? The word “check” makes it sound as if they think this is some easy to do thung, like how you could “double check” the spelling of a word using a dictionary.
- pixelpoet 11mo agoHah, so my comment here spawned a post: https://news.ycombinator.com/item?id=45904434 https://news.ycombinator.com/item?id=45904434
- AbuAssar 11mo agoYup :)
- willbicks 11mo agoThis is a truly incredible demo.
- cachius 11mo agoWay cooler than the title suggest. I nearly didn't click.
- BriggyDwiggs42 11mo agoDoes anyone know how the hell this works
- shrinks99 11mo agoYou can see everything in your field of vision, but the area DIRECTLY in the centre has the highest level of detail. This image has high frequency animated details that are not cognisized equally by your entire FOV. The animated bit right in the middle at any given time is where your brain processes the most detail and also where you are looking.
- BriggyDwiggs42 11mo agoOh cool so it’s about the frequency?
- robotresearcher 11mo agoSpatial frequency, ie. small detailed things, not temporal frequency (in this example).
- Peteragain 11mo agoI had to think about it, but are you saying all the stars are animated to rotate, but the amount they move between frames is too small for you to see unless it's in your fovea?
- pxndxx 11mo agoThey are tiny and the ones not on your fovea don't register enough "pixels" for your brain to recognise the rotation.
- Sharlin 11mo agoThey're just so small that you only see shapeless blur outside your fovea. If you applied an artificial blur filter to the whole screen, you'd also not see any movement anymore because all high-resolution detail is removed. A 3x3 box blur will erase differences between X X X X and X X X X X
- keyle 11mo agoTL;DR it helps you identify the true diameter of your visual focus, which is said to shrink with old age (mine shrinks more in terms of _time_ dimension but that's a different issue!) For best results, use it _fullscreen_, change the #define `90` values to a higher value if you're on a high dpi screen. Stare at a few places on the screen and you'll get the effect of appearing to rotate only where you stare. It's pretty neat.
- leeoniya 11mo agook, i dont get it. on my phone at typical distance and 90 scale i only see about an asprin tablet size area spinning. but at 180 scale i see almost everything spinning at same distance. i think peripheral vision is quite sensitive to movement/contrast changes, but the moving shapes have to be large enough to trigger those receptors? not sure what to conclude from this.
- hekkle 11mo agoI don't get it, all I see is: "Bad request" am I missing the joke?
- gpm 11mo agoNo, there should be a shader (think video) rendered showing a bunch of tiny spinning things. Something went wrong when you tried to load the page. It's an optical illusion where only things close to the centre of your vision look like they are spinning and everything else looks still.
- hekkle 11mo agoOkay, thanks.
- VeritySage07 11mo ago[dead]
- Taterr 11mo agoShadertoy got hugged to death by this shader a few years ago and it had a custom "please go away" banner for a little while. Funny seeing it show up again on HN front page. https://web.archive.org/web/20210430091013/https://www.shadertoy.com/view/4dsXzM https://web.archive.org/web/20210430091013/https://www.shade...
- joenot443 11mo agoThat's pretty cute. IQ's a good guy, he's had every opportunity over the years to monetize Shadertoy but it's stayed free and true to its purpose for 12y now.
- imcritic 11mo ago[flagged]
- MintPaw 11mo agoSeem iquilezles has finally given in. He's been complaining about crawler attacks a lot in the last months/years. https://x.com/iquilezles/status/1977172864785957340 https://x.com/iquilezles/status/1977172864785957340 https://x.com/iquilezles/status/1976866381099679817 https://x.com/iquilezles/status/1976866381099679817 https://x.com/iquilezles/status/1838858759336267842 https://x.com/iquilezles/status/1838858759336267842
- shadowgovt 11mo agoHow strange; it worked on my machine. Is your network incompatible with Cloudflare?
- imcritic 11mo agoProbably. They use terrorist packets, which is a no go here.
- shadowgovt 11mo agoSorry, I don't know what that means.
- xfz 11mo agoI have nystagmus (rapid, uncontrollable, rhythmic eye movements), so I couldn't see anything at first, just lots of small dots. I had to zoom in (Mac accessibility tool) but then I could see the effect briefly. My eyes go everywhere, but I could see patches of moving shapes with stationary shapes further away, only that the patch moved around a lot!
- danielvinson 11mo agoI can't see any movement, at any distance. How likely is it something weird with my vision vs. something weird with my monitor/computer? I'm on a 360hz monitor at 2k.
- koolala 11mo agoThe sizing and distance to you your face is important so you can play with that and change #define scale at the top.
- cornonthecobra 11mo agoAt the default scale of 90, I can't see anything spinning at all even with the video full screen. If I set the scale to 250 or larger I can see the stars spinning, but I just see the whole field spinning. Even if I get so close to the screen it almost fills my field of vision. So for me either the stars are too small to see any motion, or I can see them all spinning no matter what. What effect am I supposed to see?
- yreg 11mo agoTry it in full screen, if you did not. > What effect am I supposed to see? I can see only a tiny area in the center of my vision animate (at default scale). The larger the scale, the bigger the area.
- tspng 11mo agoIf I set the scale value (150) to roughly the ppi of my screen (4k 27"), I can see the effect. You should see the rotating stars only in a small field of view (fov) where your eyes are focused and all other stars should seem to remain still.
- cornonthecobra 11mo agoMy phone screen is a bit over 500 ppi. I tried it full screen across the entire range that it's in focus (I'm mildly nearsighted), and I could just see the things spinning across the whole field if the pinwheels were big enough to see motion at all. Maybe it doesn't work on small/AMOLED screens?
- antirez 11mo agoAwesome. You'll see the little stars rotating only in the area they reach your fovea, the most sensible part of the retina. All the rest will not be able to perceive any motion.
- svdr 11mo agoI first thought the spinning was an optical illusion, like https://www.nationalgeographic.com/science/article/how-our-brains-set-the-world-spinning https://www.nationalgeographic.com/science/article/how-our-b.... But in this case the spinning is real and you don’t see the rotation except in a small area (your fovea).
- maxlin 11mo agoThis is quite cool, rocked back and forth from and to my screen and got a (bit inconsistent, but consistently visible) "shape" of the fovea. maybe 30% larger than I thought it'd be! Right after though, I felt like my vision was clouded, like there was a grey overlay on it or something for a few minutes. Don't recommend having this open for too long. Visual cortex doesn't like running against its limits I guess
- stavros 11mo agoOh wow, this made me realize something I've had for 20 years: When I look too close for a few seconds, I get blurriness at the center of my vision. It goes away after a while, but this made me realize that the blurry region is actually my fovea! I have no idea why my fovea blurs when I look close up at something, and doctors haven't been able to figure it out, but at least now I can google it better.
- dalmo3 11mo agoThat reminds me of myself as a kid looking at the moon and losing focus after just a few seconds. I could never figure it out.
- smusamashah 11mo agoThe links seems to be down. From what I gathered, this is its video https://www.youtube.com/watch?v=3RUcQV3rd9k https://www.youtube.com/watch?v=3RUcQV3rd9k
- pacoverdi 11mo agoReminds me of this app that is supposed to clear up your brain when staring at the screen for a while https://www.paulkeeble.co.uk/posts/cff/ https://www.paulkeeble.co.uk/posts/cff/
- wartywhoa23 11mo agoThis actually does work!!
- gear54rus 11mo agoHow do you know?
- wartywhoa23 11mo agoFeels like a gentle rub on the skull from inside, and the overall feeling is akin to that of a lucid dream, but with a bit of nausea. Not too pronounced of course, but detectable.
- rosstex 11mo ago>clear up your brain Just to be clear, we don't actually know what that does right? Like, there's no link to this making up for poor sleep or improving your cognitive function right?
- smallnix 11mo agoBabies would go nuts over this, so much contrast and movement
- deleted 11mo ago[deleted]
- marginalia_nu 11mo agoFascinating. I get very different results depending on which glasses I use. I'm far-sighted with a relatively weak prescription. Without glasses I have a tiny bit of lazy eye, it's not really perceptible for the most part looking at me, but for stuff like this I get a sort of figure-eight shaped blob of motion that skips around a fair bit which I guess is because my eyes fail to track correctly and can't find anything to focus on. Can't perceive the motion outside of this area. With my regular glasses this there's still some of this effect, but much less pronounced. Can't see any motion outside of the center of my field of view. With my reading/screen glasses, which technically makes me myopic, I get a large perfect circle, and can still detect a lot of motion outside of the circle, even if it's "low FPS".
- davidhs 11mo agoThe strength of the glasses alters the size of the image that lands on your retinas. More (-) means a smaller image thus you stop seeing movement much closer to the focal point.
- iNic 11mo agoI have the same thing for the red blue illusion [1]. With glasses I see this effect extremely strongly, and without it is barely perceptible. [1] https://en.wikipedia.org/wiki/Chromostereopsis https://en.wikipedia.org/wiki/Chromostereopsis
- qwertytyyuu 11mo agowoah its incredible how quickly i can spot the fuzzy spot around where i can clearly see the rotation, and when i unfocus can see fuzzy movement all around. This is really cool. So this is the theory beind foveated rendering/streaming
- deleted 11mo ago[deleted]
- rana762 11mo ago[dead]
- NKosmatos 11mo agoWhat kind of sorcery is this? Incredible visualization!
- wartywhoa23 11mo agoI wish there was an url parameter to share this fullscreen right away! UPDATE: And yep, there (mostly) is! https://www.shadertoy.com/embed/4dsXzM?gui=false&paused=false https://www.shadertoy.com/embed/4dsXzM?gui=false&paused=fals...
- ludicrousdispla 11mo agoIt's important to point out that all of the crosses are rotating, so this is effectively showing which parts of your vision are susceptible to change blindness (which is effectively 99% of it).
- zdc1 11mo agoThis would make for a cute screensaver
- sd9 11mo agoThe idea is to look at the scene and observe which crosses are rotating. You will notice that in your peripheral, the crosses appear not to rotate (although they are, and you can check that by focusing on them). This gives you an idea of how large your fovea is. On a retina Mac I had to double the scale value to get reasonable results.
- theturtle 11mo ago[dead]
- astroflection 11mo agoI get about 4cm wide at 50cm distance.
- smusamashah 11mo agoDiscovered Maxwell's Spot illusion while looking further into this https://www.psy.ritsumei.ac.jp/akitaoka/Maxwell_spot_illusion-shitsukan-shikisai2024-07.gif https://www.psy.ritsumei.ac.jp/akitaoka/Maxwell_spot_illusio... This is a flickering blue/green image. In the center wherever your eyes are looking, you will see a dark spot.
- ge96 11mo agodoes your brain just give up when the little stars seem to be still until you focus on one/a few oh I see fovea
- tgbugs 11mo agoA fully psychometric version of this that explores more than just the fovea could be created by varying the scale parameter (if you crank it up high enough you can see the movement in the periphery). The additional component you would need is to have trials where the subjects has to report whether a particular region (could even be cued with a red circle, I don't think it needs to be random) is actually moving or not while fixated on the center. There are clearly cells that detect this kind of motion in the periphery but they need larger visual input, possibly because the receptive fields of the cells that feed in are larger out there.
- ladon86 11mo agoIt's not possible to smoothly move your eyes unless you are tracking a moving object. Your eyes always move in saccades (quick jerky movements), unless there is a smoothly moving object, in which case your eyes gain the ability to track it smoothly. https://www.shadertoy.com/view/tXSBWt https://www.shadertoy.com/view/tXSBWt Here is a version with a smoothly moving red circle; notice how you can now move your eyes smoothly around the screen as you track the circle.
- Anamon 11mo agoLink doesn't work -- I guess this one is similar to what you describe? https://www.shadertoy.com/view/WdlGzl https://www.shadertoy.com/view/WdlGzl
- scotty79 11mo agoThat's how small the high quality input to your neural network is. All your smart neurons start their inputs there (let's skip hearing for a moment). Every time you did math it worked on neurons with their roots at this small bunch in the visual cortex. It's a tool for reusing training data. When you move your eyes around same neurons are fed new data samples. It's basically same trick that convolutional neural nets use.
- burnt-resistor 11mo agoHave monofixation syndrome, so I can't see this or stereograms.