What is visual snow syndrome?
Visual snow is a constant pattern of tiny dots across the whole field of vision, most often described as black-and-white static. It’s recognized as a neurological condition with its own diagnostic criteria. People with the full syndrome also have other visual symptoms, such as afterimages, floaters, trouble seeing at night and light sensitivity.1
How common is light sensitivity in visual snow?
Very common. In an online study of more than 1,100 people with visual snow, light sensitivity was among the extra symptoms reported most often, along with floaters and afterimages. Migraine and tinnitus were also common, and people who had them tended to have more severe visual snow.1
Why can screens be harder with visual snow?
A screen is a bright light you look straight into, and many screens add movement of their own: PWM dimming pulses the backlight, and FRC dithering flickers pixels between shades. Your retina responds to flicker even when it’s too fast to see consciously.2 No research has tested screen flicker in visual snow specifically, but if your visual system is already noisy, a steady screen is one less thing to process.
Tips for screen use with visual snow
- Try dark mode or dimmer, warmer settings if bright white backgrounds bother you.
- Keep room lighting even, so the screen isn’t the only bright thing in view.
- Take breaks and look into the distance.
- Choose a screen with steady light and steady pixels: no PWM and no FRC dithering.