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Floaters can occur mainly in the elderly or in people with severe myopia. The cause is a jelly-like substance in the eye called the vitreous. It liquefies, shrinks, and condenses due to aging. And it separates from the retina at the back. At this time, debris is formed, and the parts where the optic nerve is located are punctured.
However, when light enters the vitreous body, the light hits the vitreous debris and scatters. That's why the light spreads. This is called floaters, or flyers. It moves with your eyes as if it's floating in your vision, like a fly, and you can feel it better when you see light, especially when you're looking at a blue sky. Floaters usually occur in one eye, and although they occur in both eyes, they are not symmetrical.
In the case of Visual Snow, there may be floating things like floaters, or there may be dark spots that look hidden. And the small dots have a moving pattern. The difference from floaters is that it usually occurs in both eyes and usually occurs in young people. In addition, there is a symptom called repetitive vision, which leaves an afterimage when an object moves. There are also cases where such repetition is appealed.
This kind of visual snow is not a problem of the eyes, but of the brain. Therefore, if there is a stimulus in the brain, the stimulus can affect both eyes.
It can also be accompanied by headaches, migraines, tinnitus, depression, and anxiety disorders.
Nothing is known exactly what causes visual snow yet. However, there are hypotheses that it is caused by an overabundance of "acquisition" in which the body responds to some external stimulus. Some people think it's a form of migraine or epilepsy.
However, if you have these symptoms, you can't immediately diagnose it as visual snow. First, you need to make sure that you don't have an eye or brain problem. So, through electrophysiology tests*, MRI scans of the head, etc., we can rule out that there is no problem with the eye itself and no organic problem with the brain itself, and then we can diagnose it as visual snow.
So far, there have been no definitive experiments on visual snow therapy. Headache medications such as Topamax, Lamotrigine, and Diamox may be prescribed, but some people feel uncomfortable with the medication because of weakness or other things.
Or you can use special colored glasses. There are lenses that block the 480~520nm wavelength that irritates the eyes. In the United States, it is marketed as Axon Optics. In our country, these are the ones that are labeled driving lenses. However, many people say that the color of the lenses is red and purple, so it is difficult to use them in everyday life.
In conclusion, visual snow can be a chronic condition in young people with dots moving in both eyes at the same time, constantly flickering. And it is often accompanied by symptoms such as migraines and tinnitus.
However, not all cases can be diagnosed as visual snow, but when symptoms persist for more than 3 months and there are no other eye diseases or functional structural problems in the brain, we can suspect visual snow. Normally, there is no problem with the vision itself, but if you experience a lot of discomfort, you may want to try medication or special glasses.
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