from Hacker News

Show HN: Refractify – Optical software against myopia

by macilacilove on 2/23/24, 6:47 PM with 55 comments

Last summer there was an Ask HN[1] about a Nature article that said bluring the blue and green color channels on screen may be good against early myopia development. The OP wanted such software and there was none available.

So I quit my job and implemented this software, did a short video with a 3D artist about it.

Turns out marketing is expensive, so I made an open source browser extension version too.

How it works?

There is a small neural network on the retina that tries to detect if the eye is far-sighted(most people are born far-sighted), and it is producing dopamine to slow or increase eye growth rate. It is not very smart, and if you do a lot of near-work it can think you are still hyperopic, causing further myopia progression.

So, based on the refractive properties of the eye the software calculates the signal that would convince the retinal neural network that the eye is long enough, so it would produce dopamine, a known signal to stop axial eye growth. (based on myopic defocus LCA from the papers[2][3])

Some myopia control techniques work similarly, like MiSight and Hoya lenses.

Since then I got a Neurobiologist co-founder and the goal is to best understand the Retinal NN to create the best anti-myopic effect that does not interfere with productivity.

The effect can be tried live on the site. Also check out the github repo. Any questions suggestions welcome!

[1] https://news.ycombinator.com/item?id=37019143 [2] https://www.nature.com/articles/s41598-022-26323-7 [3] https://www.sciencedirect.com/science/article/abs/pii/S00144...

  • by stevebmark on 2/24/24, 5:31 AM

    Wow, this is the first Hacker News post I've seen where someone actually understands myopia, emmetropization, and peripheral defocus. Every other post on myopia is filled with people guessing their own random nonsense about Bates, wearing underpowered lenses, and outdoor light. Completely unifnored. I also had no idea about the relative blur of different color wavelengths. I wonder if that's related to the possible "toxic" effect of blue LED light on the macula.

    I've installed your Chrome extension and I'm eager to learn more. It's too late for my vision, but it's still getting worse for me in middle age, so I'm very interested in the state of the art based in real science.

  • by scottmsul on 2/24/24, 1:07 AM

    Congrats!

    For anyone who's interested, there's a group of us dedicated to natural myopia reduction at reducedlens.org, which is a free and open-source fork of endmyopia. I've even started measuring my axial length to try and get better data on if this stuff actually works (only one measurement so far though, so nothing interesting yet).

    The nature paper was pretty crazy. Basically because blue bends more than red (think of a prism), it also focuses a bit sooner. This phenomenon is known as longitudinal chromatic aberration, or LCA for short. This means if you're myopic, blue might be more blurry than red, and vice-versa if you're hyperopic. The researchers in the nature paper had participants watch a movie where they straight-up blurred the blue or red with software, in order to produce fake LCA signals. They found the participants axial lengths still shortened or lengthened anyway in response.

  • by pedalpete on 2/24/24, 12:10 AM

    This is very cool and exciting. It seems like a good method to reduce the development of myopia.

    However, my understanding is that myopia is also simply age related. Discussions I've had recently were looking at the hardening of the lens as a factor.

    I've been trying to re-train my eye with an eye chart, and I've been surprised how after just a few weeks, my vision has gotten much clearer. Going from 20/40 to nearly 20/25.

    In the past few weeks I've started taking collagen to increase/maintain flexibility in the eye, and will continue with the eye exercises.

    This is in no way to say that refractify is not valuable. I think it is and I'd add it to my routine.

    I should also state that I have corrected my eyesight once before. When I first became a software engineer, I noticed my eyesight degrade quickly (I was in my 30s). I made a conscious effort to spend time outside looking long-distance such as reading street signs from as far away as I could. My eyesight improved dramatically. However, as I've aged, I went from 20/15 to 20/40. Note: 20/15 was examined by a doctor, 20/40 is self measured with an eye chart.

  • by dannyw on 2/24/24, 6:05 AM

    I purchased the Windows version and uploaded the file to VirusTotal. It gave me two detections: https://www.virustotal.com/gui/file/4da40fd5c643e9c7e771b896...

  • by jmole on 2/24/24, 3:54 AM

    here's the effect at 100% strength: https://imgur.com/a/PfrIsex

    and a more reasonable 35%: https://imgur.com/a/doT8YKd

  • by kirill5pol on 2/23/24, 10:04 PM

    This might be one of the coolest projects I’ve seen recently, are you planning on doing this for smartphones too? Also I wonder how Apple would respond there, just block it like they did Flux?

  • by _kush on 2/24/24, 4:29 AM

    This is brilliant, thanks for making this. I am currently trying it out on Chrome and I can feel the difference. Any future plans of bringing this to the mac? I recently made an app[1] in the similar space for mac and I would love to collaborate to bring this to the mac if you'd be interested.

    BTW, all the links in your footer except privacy policy are 404s

    [1] https://lookaway.app

  • by justforasingle on 2/24/24, 12:45 AM

    You might be interested in endmyopia.org

    Its about controlled axial length changes to the eyeball with differing methods.

  • by tamimio on 2/24/24, 3:04 AM

    > Pre-clinical studies suggest that it may slow the progression of myopia or even prevent it.

    But the video says “treating” it, so which one? I assume it’s just to prevent it but if you have it you better start looking for that Lasik surgery.

  • by vintagedave on 2/24/24, 10:46 AM

    > The effect can be tried live on the site

    I tried the button on both Safari (initially) and Chrome, and I'm struggling to understand if I'm actually seeing what I should see. When on, zooming in to the text shows it's turned a very slight green shade of grey, vs grey when it's off. Visually that's the only difference I saw.

    Perhaps I misunderstood "blurring the blue and green channels". I expected some sort of slight but noticeable blur, ie across pixels, but should I actually be seeing _blending_ of the blue and green channels, ie colour mixing but on a per-pixel level?

  • by macilacilove on 2/23/24, 6:47 PM

    Since last summer I learnt some about emmetropization, visual cues to myopia control and the state of consumer software business. Please let me know if you would like to discuss anything.

  • by mcdonje on 2/23/24, 9:33 PM

    Interesting.

    Is the physical screen ideal or are software solutions expected to have similar efficacy?

    I wonder if it's possible to make an android app that does this globally.

    What's your business model?

  • by hnenjoyer_93 on 2/24/24, 12:22 AM

    This seems great, but I have 2 questions:

    1. Since this is for "early myopia", does it mean it is useless for adults? If not, which groups of adults will find it useful?

    2. What do you think about this and is this even related?

    > The overall findings are equivocal with under‐correction causing a faster rate of myopia progression. There is no strong evidence of benefits from un‐correction, monovision or over‐correction. Hence, current clinical advice advocates for the full‐correction of myopia

    https://www.tandfonline.com/doi/full/10.1111/cxo.12978

    Edit to clarify, full correction with glasses should mean always seeing the sharpest picture possible

  • by leobg on 2/23/24, 10:37 PM

    > This makes the screen look on the retina naturally as if it was at a greater distance.

    You can also do this the low tech way by using dirt cheap plus lens glasses. With the added benefit that they make a tiny phone screen look as huge as a cinema screen.

  • by diimdeep on 2/24/24, 8:07 AM

    Sorry, but when there is no solid scientific verified foundation but you already selling software for $12 a piece I call it snake oil.

    > The participants were asked to watch binocularly a movie on a large TV screen (65 inches, LG OLED65C9, 4 K, 2019) at 2 m distance in a dark room. > With a video format of 1280 × 720 pixels

    So you have to work in pitch dark room for this approach to reproduce, no thanks.

  • by rzmmm on 2/24/24, 9:25 AM

    Will this increase the risk of hyperopia? Afaik its common people are both myopic and hyperopic at the same time

  • by KTibow on 2/25/24, 4:36 AM

    What's the deal with why it isn't available on Firefox?