Visual Disturbances: Why Do Colors Shift When Moving? - Ophthalmology

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Understanding visual disturbances, especially when it comes to color perception and movement, can be quite complex. The phenomenon you are experiencing with the red and green lights, where the text appears to shift or overlap when you move your head, is not uncommon and can be attributed to several factors related to how our visual system processes information.

Firstly, when you observe a static object, such as a traffic light or an electronic display, your eyes and brain work together to stabilize the image. This is known as "visual fixation." However, when you move your head, even slightly, the visual system must adjust to maintain focus on the object. This adjustment can sometimes lead to a perception of movement or distortion in the image, especially if the object has contrasting colors, like red and green.
One reason for the apparent movement of the text is due to a phenomenon called "motion parallax." This occurs when objects at different distances from the observer appear to move at different rates as the observer shifts their viewpoint. In your case, the letters on the electronic sign may be perceived as moving because they are at a different distance compared to the background. The brain interprets this difference in motion, leading to the sensation that the letters are shifting or overlapping.

Additionally, the use of LED lights in electronic displays can contribute to this effect. LED lights can flicker at high speeds, and when combined with the persistence of vision (the phenomenon where an image lingers in the eye for a fraction of a second after it has disappeared), it can create an illusion of movement or overlap when you shift your gaze. This is particularly noticeable with bright colors like red and green, which can create a strong contrast and enhance the visual effects.

Moreover, if you have a refractive error, such as myopia (nearsightedness), which you mentioned having, it can also affect how you perceive images, especially at different distances. If your vision is not perfectly corrected with your glasses, it could lead to additional distortions or difficulties in focusing, which might exacerbate the sensation of movement or overlap when you move your head.

In summary, the shifting and overlapping of colors you observe when moving your head is likely a combination of motion parallax, the flickering nature of LED displays, and possibly the effects of your refractive error. This is generally considered a normal visual phenomenon, especially in dynamic environments. However, if you experience persistent or troubling visual disturbances, it is always a good idea to consult with an eye care professional for a comprehensive examination to rule out any underlying issues. Regular eye check-ups are essential, especially if you have existing vision problems, to ensure that your eyes remain healthy and your vision is well-corrected.