Dark Spots, Flashes, or Shadows
Seeing sudden flashes, black spots, or a shadow in your vision may point to retinal detachment. According to the article, “This is an emergency; get to an eye doctor immediately.” Left untreated, it can lead to permanent vision loss.

Changes in Eye Shape or Pupil Size
Bulging eyes may be caused by hyperthyroidism, especially from Graves’ disease, or even a tumor. Unequal pupil sizes without a known reason could indicate a neurological problem. Both signs require urgent medical attention.

Red, Dry, or Double Vision
Persistent dryness and redness might be linked to autoimmune diseases like Sjögren’s syndrome or rheumatoid arthritis. Double vision, on the other hand, could stem from nerve damage, multiple sclerosis, or an aneurysm.

If you experience any of these symptoms, don’t wait. “Your eyes can alert you to more than vision problems—they may be signaling life-threatening health concerns.” See a doctor right away.