Many people have encountered in life, long timewhen sitting or squatting for a long time, suddenly get up and feel black in front of the eyes , It will also be accompanied by dizziness, and the symptoms will disappear immediately.
This condition is medically known as “Amaurosis transient”, which is a temporary appearance of the eyes Diminished or lost vision.
Causes of amaurosis
Squatting for a long time suddenly stands up, because autonomic regulation increases the blood supply to the heart and brain, if the body’s autonomic regulation is slower than the speed of standing up, it may appear “transient” Darkness”, if occasionally does not matter.
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Orthostatic Hypotension
Orthostatic hypotension refers to a sudden drop in blood pressure when standing for a long time or changing body position, causing dizziness, blurred vision, fatigue, nausea, and transient dark eyes.
This condition, more common in older adults, is mainly due to the body’s reduced ability to regulate blood pressure. The head should be raised about 20 degrees when resting, and the movement of getting on and off the bed should be slow. Move around in bed, get out of bed slowly, and drink plenty of water as appropriate.
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Carotid stenosis
If the carotid stenosis is severe, which affects the blood supply of the carotid artery to the brain, dizziness, dark eyes and other insufficient blood supply will also occur. Be careful in this case, go to the hospital for examination as soon as possible, and require medical treatment or surgery.
transient ischemia
When focal ischemia of the brain, spinal cord, and retina occurs, resulting in transient autonomic dysfunction, although it is not as serious as stroke, transient cardiac and cerebral ischemia indicates: Recent brain injury The risk of stroke is greatly increased, and it is necessary to go to the hospital for diagnosis as soon as possible.
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Anemia
Anemia has decreased hemoglobin, decreased oxygen-carrying capacity, dizziness, dark eyes, and fainting. Don’t worry, Anemia treatment can be improved >.
Cardiac Vertigo
Mainly due to a severe slow arrhythmia, which causes insufficient blood supply to the heart and brain, dizziness and dark eyes. It is necessary to complete the examination as soon as possible, and there may be acute myocardial infarction and viral myocarditis.
There are many reasons for dark eyes and dizziness. If there is no history of disease, there is no other discomfort in occasional attacks, there is no need to worry too much.
If frequent amaurosis occurs, be sure to go to a regular hospital for examination, complete blood routine, carotid and vertebral artery ultrasound, brain scan and vascular magnetic resonance, electrocardiogram , Holter monitoring, determination of etiology, and targeted treatment.
Author: Yang Shuang,
Heyuan People’s Hospital
Cardiovascular Medicine, Associate Chief Physician