Critical Visual Symptoms You Should Never Ignore

4. Temporary or Sudden Vision Loss Any sudden loss of vision, even if it lasts for only a few seconds or minutes before returning to normal, must be investigated immediately. This phenomenon, known medically as amaurosis fugax, often feels like a dark shade being pulled over the eye and is frequently caused by a temporary disruption of blood flow. Doctors often refer to this as an "eye stroke," and it serves as a critical warning sign for an impending major stroke. Individuals with high blood pressure, diabetes, or high cholesterol are at higher risk and must seek urgent care to prevent permanent arterial blockages.