Part of that study involved taking volunteers' blood pressure when they were laying down and when they stood up. Over the next 17 years, give or take, the researchers followed these participants to see which ones developed heart failure.
Data showed that those with OH had a higher risk of developing heart failure than those without OH, even after accounting for other heart failure risk factors, such as overall high blood pressure, diabetes, and coronary heart disease. Are you at risk for heart disease? Take our quiz to find out. Keep Your Heart Healthy for Life!
Study author Christine Jones, M. Over time, that can cause the heart to pump harder and eventually fail. If they occur without pain, it is often called as a migraine without a headache.
While less common, phosphenes can occur due to a problem in the areas of the brain that handle vision. This may occur because blood isn't flowing properly. It can also happen because of brain damage. Cerebrovascular disease blood vessel disease in the brain or systemic low blood pressure can result in less blood supply to the brain. The brain may not function as well without enough blood supply.
Postural hypotension is a sudden drop in blood pressure. This can happen when someone who already has high or low blood pressure lies down or stands up too fast. This drop in blood supply can trigger flashing lights or similar phenomena for a few seconds. Seeing stars is known as photopsia. The individual flashes of light are called phosphenes. They often occur when pressure on the eye stimulates the retina. The retina is a light-sensing part of the eye.
Pressure can be caused by an outside force, such as rubbing your eyes, or internal structural problems or inflammation. Photopsia can also occur with migraines, changes in blood pressure or blood flow to the brain, or brain damage. Photopsia is usually harmless. However, if you see them often, tell your healthcare provider or eye doctor. If you have other symptoms like a shadow or curtain in your vision or an increase in floaters, get emergency help right away.
Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Photopsias: A key to diagnosis. Visual snow: Visual misperception. J Neuroophthalmol. Posterior vitreous detachment - prevalence of and risk factors for retinal tears. Clin Ophthalmol.
American Society of Retina Specialists. Posterior vitreous detachment. Updated Differential effects of HCN channel block on on and off pathways in the retina as a potential cause for medication-induced phosphene perception.
Invest Ophthalmol Vis Sci. The clinical characteristics and neurophysiological assessments of the occipital cortex in visual snow syndrome with or without migraine. American Migraine Foundation. Understanding ocular migraine.
October 19, Occasionally you see a star like these generous celeb tippers , and it's great fun. However, sometimes after you hit your head, stand up quickly, or rub your eyes, you may see stars or bright dots of light in your eyes, which can be shocking to see. You may see them at other times as well. You may see stars, or phosphenes, after a hard sneeze, which Health noted usually doesn't indicate a serious problem.
While most flashes of light are often relatively benevolent, sometimes they warrant a call to your doctor if they appear frequently. So what's happening when you see these esque "stars"? Do they only occur upon rubbing? Does everyone experience them? Before we can get to what causes the lights, we need to understand a bit about how the eyes work. Angie Wen, a cornea surgeon at New York Eye and Ear Infirmary of Mount Sinai, tells Mental Floss that the retina—the innermost layer of the eye—consists of millions of cells, or photoreceptors.
These cells, she says, "are responsible for receiving information from the outside world and converting them to electrical impulses that are transmitted to the brain by the optic nerve.
Then, the brain interprets them as images representing the world around us.
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