The sudden appearance of flashing lights, blind spots, or zigzag lines can be signs of a bad headache on the way. According to the National Headache Foundation, these visual disturbances, known as auras, affect around 20% of migraine headache sufferers. In general, auras only affect one side of the person’s vision, and they last about an hour or less, as explained by the American Migraine Foundation. Medical science has not yet explained the aura, but the zigzag patterns are common to aura sufferers, even if the explanation is still unknown. Sudden specks or flashes of light can also be a sign of a torn retina. That’s especially true if the flashes or spots are accompanied by a shadow or loss of peripheral vision, which very likely indicates a detached retina.
5. Ring Around Your Cornea
This condition, called corneal arcus, causes a gray-white line of fat deposits to grow on the outside edge of your cornea. Sometimes, the deposits make a complete ring. While this particular color change is most commonly a sign of aging, if you’re under 40, it could be a sign of dangerously high cholesterol and/or triglycerides, which might mean an increased risk of heart attack or stroke. So in any case, if you notice these white rings, it’s time to go for a check-up.
4. Droopy Eyelids
While for many people it’s just a sign of fatigue, if you have one or both eyelids drooping toward the pupil, it can be a symptom of myasthenia gravis, an autoimmune neuromuscular disease which makes your immune system attack and weaken your muscles. It affects your eye, face, and throat muscles more than others and can make it difficult to chew, swallow, or even speak. It’s a potentially deadly disease which requires medical treatment. In some cases, surgery is necessary to remove the thymus gland.Related: 8 Reasons for Red Eyes and What to Do