why do my eyes go black on roller coasters
Greyout Another common occurrence of greyouts is in roller coaster riders. Many roller coasters put riders through positive g-forces,[4] particularly in vertical loops and helixes. Roller coasters rarely have high enough negative g-forces to induce redouts, as most low-g elements are designed to simulate weightlessness.
Afterimage An afterimage is an image that continues to appear in one's vision after the exposure to the original image has ceased. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological afterimages. Afterimages occur because photochemical activity in the retina continues even when you are no longer experiencing the original stimulus.[1][2] The remainder of this article refers to physiological afterimages. A common physiological afterimage is the dim area that seems to float before one's eyes after briefly looking into a light source, such as a camera flash. Afterimages are a common symptom of visual snow.