Study about colour test in china
Hello everyone, a few days ago I discovered a study from a hospital in China where a process called photobiostimulation could improve Ishihara and D-15 test results. You can take a look and read it carefully.
It was published in a scientific journal and is completely true and proven. It started in 2024 and was repeated in 2025. Furthermore, the experiment is very simple: it involves watching a video on a mobile phone screen twice a day, every 12 hours, where the screen alternates between red and green every few seconds. The study itself includes the video in the attached materials/extras section S1, and it can be downloaded completely free of charge. The only remaining question is the light irradiance emitted by our mobile phones. They measured it, not because they needed an exact value, but simply to know the general range.
We could compare these results with a CAD test to see if there's real improvement, and this might be useful for some of us. If we can get this information to many people with this problem, and some who have easy access to a CAD test to see if they've improved, it's possible that someone on the borderline could pass the CAD test.
I've included a summary of the test here; you can ask ChaT GPT to summarize everything, and he explains it very well.
Perhaps we're getting a little closer to a cure for color blindness every day.
In 2024, a clinical trial on photobiomodulation (PBM) in people with congenital red-green color blindness (protan/deutan) was published in Frontiers in Medicine. Seventy-four people participated: 37 in the treatment group and 37 in the control group. The treatment was surprisingly simple: participants watched a full-screen video that alternated between red and green with their eyes open, using VR glasses/visors.
The treatment lasted 4 weeks, with 2 sessions per day, separated by approximately 12 hours. Each session lasted approximately 6 minutes and 20 seconds.
The researchers physically measured the light used and reported the following approximate values:
🔴 Red: 621 nm — 0.00869 W/m²
🟢 Green: 524 nm — 0.0221 W/m²
Important: These wavelengths were measured on the playback system; they are not simply values encoded as “nm” within the MP4 player.
They assessed color vision before treatment and after 1, 2, and 4 weeks, using the Ishihara, Farnsworth-Munsell 100 Hue, and Color Blindness Check (CBC) tests.
They found a statistically significant improvement in the treated group. For example, the average number of correctly identified Ishihara plates increased from approximately 2.3 before treatment to 3.8 after 1 week, 4.0 after 2 weeks, and 5.4 after 4 weeks. The number of errors also decreased considerably with FM-100 Hue.
Both protan and deutan participants showed improvement. Photobiomodulation (PBM) was not shown to "repair" the genes responsible for color blindness, nor to literally transform abnormal cones into normal ones. The authors propose a functional improvement of photoreceptors/cones through photobiomodulation, but the exact mechanism remains unproven.
Subsequently, in 2025, the same group published another trial with 80 participants. In this study, they tailored the exposure to the type of color blindness: individuals with red color blindness received red light (621 nm), those with green color blindness received green light (524 nm), and those with red-green color blindness received a combination of both. They again found significant improvement compared to the control group, particularly pronounced in the green color blindness group. In that second study, the setup is described in more detail: they used a smartphone placed inside a VR headset compatible with mobile phones (Storm Mirror Little D). In other words, it was neither a laser nor a specialized medical PBM device.
The first article also includes the original treatment video as supplementary material (Supplementary Material S1). The main limitations are significant: the studies are essentially from the same research group, independent replication is lacking, the duration of improvement after discontinuing treatment has not been established, the optimal wavelength/dose still needs to be determined, and they did not use CAD, which would be particularly interesting for assessing aeronautical relevance.
Therefore, it is a very interesting experimental result, but it does not yet constitute an approved treatment for congenital color blindness.