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Doctor insights on: What Causes A Sudden Black Out In Vision

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What causes a sudden black out in vision?

What causes a sudden black out in vision?

Many things: A number of conditions can cause a sudden blackout of vision. Most of these are vascular events affecting important structions in the visual pathway, such as retinal aretery or vein occlusion, hemorrhages, and vasospasm. We see with both our eyes and our brain, and these structures require perfusion of blood for oxygen, butrition and proper function. ...Read more

Dr. Richard Bensinger
1,726 Doctors shared insights

Vision (Definition)

Vision is a feature of a person's brain that allows him to see. He must have normal eyes, optic nerves (that stretch from the eyes to the back of his brain), and visual cortex (the vision center in the brain), in order to see properly. An ophthalmologist is a ...Read more


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What can cause an abrupt black out in vision, and some dizziness with a spinning sensation, for a half minute?

What can cause an abrupt black out in vision, and some dizziness with a spinning sensation, for a half minute?

Many things: Physiologic adjustment after asphyxiation or suddenly getting up, positional vertigo, inner ear infection, migrains etc. ...Read more

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Possibly causes of split second black out in vision? Young, healthy, no risk factors of any kind. Taking. 25 clonazapam. Have inactive Graves disease.

Possibly causes of split second black out in vision? Young, healthy, no risk factors of any kind. Taking. 25 clonazapam. Have inactive Graves disease.

Many causes: This can be due to anxiety, the clonazepam (Klonopin), TIA (amaurosis fugax), etc. See your physician immediately to discuss your symptoms in detail and to review your risk factors as well as to undergo a complete neurological and ophthalmologic exam. Http://www. Nlm. Nih. Gov/medlineplus/ency/article/000784.htm ...Read more

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What could cause someone to black out, fully conscious in the shower. Lasted for less than a minute. Vision came back hazily at first and then fully?

What could cause someone to black out, fully conscious in the shower. Lasted for less than a minute. Vision came back hazily at first and then fully?

Postural Hypotension: Low blood pressure is a common cause of "blacking out" that can be benign--unless, of course, the person hits his/her head on the way down. There are many other reasons why one would black out: medications, malnutrition, stroke, low blood sugar, dehydration, diabetes, seizure, infection, fever, and more. See your doctor for a complete physical and blood work. ...Read more

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What causes vision black out and loss of balance?

What causes vision black out and loss of balance?

Vertebrobasilar art?: Transient obscurations of vision, especially on rapid standing, can cause a bilateral dimming of vision with lightheadedness. The cerebellum is a balance control center and is located in an area of the brain near the visual cortex. A vertebrobasilar artery occlusion could cause both symptoms. A neuro-ophthalmologist can check your mri. ...Read more

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Why do I loose my vision when I black out?

Why do I loose my vision when I black out?

Lack of blood supply: The eye needs a good blood supply and most black outs are like fainting in which the blood pressure drops and you lose consciousness. At your age what are you doing to cause this? If these are spontaneous, then you should see your family doctor for evaluation. ...Read more

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I'm seeing black out only on the right side of my vision, why?

Only able to y: Determine the cause by examining you eyes. Pay attention if it moves with eye movement or if there is any flashing lights associated with this. See an ophthalmologist for this. ...Read more

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Why does my vision go fuzzy and or black out when I stand up? It doesn't happen when I'm sitting down.

Why does my vision go fuzzy and or black out when I stand up? It doesn't happen when I'm sitting down.

This is: Called orthostatic hypotension. It means that your blood pressure to your brain suddenly drops due to gravity when you stand up.

Discuss this with you primary care physician. ...Read more

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When I stand up after sitting or lying down for 15 minutes or more I always lose my vision (black out)for 3-5 seconds and I feel extremely dizzy like I'm going to pass out is that normal?

When I stand up after sitting or lying down for 15 minutes or more I always lose my vision (black out)for 3-5 seconds and I feel extremely dizzy like I'm going to pass out is that normal?

Syncope: This sounds like orthostatic hypotension. Your blood pressure drops when standing. Keep hydrated. Caution when standing. See your doctor to make use it is not cardiac in origin. Caution with driving. ...Read more

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Black out, racing heart, face numb, tunnel vision could be signs of what?

Black out, racing heart, face numb, tunnel vision could be signs of what?

Hard to say: Symptoms such as those asked about, when all together, may be caused by an anxiety attack. If the anxiety attack is accompanied by hyperventilation (breathing really fast or superficial), than breathing in and out of a paper bag can help shorten the episode. As always, when you have concerning symptoms, please see a medical professional in person for an evaluation. ...Read more

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What could be causing this? When I stand up I get dizzy and start to black out and when my vision starts to clear, my lips and finger tips feel numb.

What could be causing this? When I stand up I get dizzy and start to black out and when my vision starts to clear, my lips and finger tips feel numb.

See your doctor: There could be many causes of these symptoms. Your blood pressure could be dropping when you get up quickly ("orthostatic changes"), your heart rate may be abnormal, or there could be other causes. Your symptoms need to be evaluated as soon as possible. I wouldn't drive yourself anywhere until you find out what is going on... ...Read more

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Left eye peripheral vision gets yellow moving spot along with peripheral vision black out. Docs says retina is OK. Mild pain in eye as well. Help!!

Left eye peripheral vision gets yellow moving spot along with peripheral vision black out. Docs says retina is OK. Mild pain in eye as well. Help!!

Probably migraine: Your peripheral moving yellow fringe spots with adjacent darkened areas w/ mild ocular discomfort sound migrainous in nature. Your retina doctor reviewed your eye & indicated your retina was fine & not the source of the disturbance which is reassuring. Yours symptoms are likely triggered by stressors. Speak to your family doctor for advice on how to manage these symptoms. ...Read more

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What can cause you to black out?

What can cause you to black out?

A million things: If you are passing out, becoming unconscious, that is a medical emergency and needs to be evaluated. It can be caused by strokes, heart attacks, heart arrhthmias, a blood clot to the lungs, or severe loss of fluid -dehydration or bleeding. If you mean an alcoholic blackout - not remembering what happened - alcohol does that as a toxic effect, and other rapid acting sedatives can do the same thing. ...Read more

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What could cause me to black out?

What could cause me to black out?

Many possible causes: The list is pretty long including (heart conditions, seizure, ear problem)
also low blood pressure could cause it ...Read more

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What can cause a sudden black out?

What can cause a sudden black out?

Vasovegal: Vasovegal responce; also dependes on age. You have to check the heart valve and carotid artery by doing ultrasound. ...Read more

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What could cause me to black out when I am angry?

What could cause me to black out when I am angry?

Alcohol: Consider attending a meeting of alcoholics anonymous if you are blacking out from drinking. ...Read more

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What could cause a person to black out for an hour?

What could cause a person to black out for an hour?

Carotid narrowing: Carotid artery stenosis and heart valves leaking and also concusion can cause it. ...Read more

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What could cause someone to black-out in the shower?

What could cause someone to black-out in the shower?

Maybe it got hot: A person who gets overheated will automatically dilate (widen) the blood vessels in his skin so that more blood will flow to the skin. His body does this in hopes of cooling him down, just like the elephant who sends more blood to his ears to cool his body down. The person, however, feels lightheaded and may faint because there is not enough blood flowing his brain (too much blood is in the skin). ...Read more

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What can cause me to get a sudden rush like I'm going to black out?

What can cause me to get a sudden rush like I'm going to black out?

Low BP&Low Sugar: It may be due to low BP or low blood sugar.I suggest you get yourself checked asap ...Read more

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Can dehidration cause you to be sick and black out?

Can dehidration cause you to be sick and black out?

YES: Feeling thirsty
urinating less often, or having dark yellow or brown urine
a dry mouth or cracked lips
no tears when a child cries
feeling tired or confused
feeling dizzy or light-headed
eyes that look sunken in the face
a “sunken fontanel” (in babies) – a fontanel is a gap between the bones in a baby’s skull. When babies are dehydrated, the fontanel on the top of t. ...Read more

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What would cause someone to black out while driving?

What would cause someone to black out while driving?

May mean alcoholIsm: If blackouts occur after alcohol use, consider attending an aa meeting. In any case, consult a physician. ...Read more

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What causes you to cough so hard that you black out?

What causes you to cough so hard that you black out?

Possibilities...: The most common causes of cough include acute bronchitis, usually caused by an infection of the airways, bronchospasm, gerd, post-nasal drip, chronic bronchitis, a form of copd. If you are coughing and passing out, called post-tussive syncope, you need to see your doctor so your cough can be definitively diagnosed and treated. If you smoke, you need to quit asap! ...Read more

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What is the cause of a black out when your in a car accident. Plz help?

What is the cause of a black out when your in a car accident. Plz help?

Black out: Blackouts or loss of consciousness during a car accident could be caused by a number of things: direct head injury causing trauma to the brain, whiplash causing trauma to the brain by whipping it back and forth inside the skull and then simple syncope or fainting from shock of stress/anxiety. Are you the person who was in this car accident? ...Read more

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What causes a person to faint? Apart from somthing simply being overwhelming, exactly how dose the body cause the person to faint or pass out or black out for a sec?

What causes a person to faint? Apart from somthing simply being overwhelming, exactly how dose the body cause the person to faint or pass out or black out for a sec?

Common denominator: The common denominator is often reduced global perfusion to the brain. This is most often from a drop in blood pressure such as from hemorrhage (like a gunshot wound) or from a cardiac rhythm disturbance, sometimes with dilated blood vessels like with a simple faint. A direct CNS agent, like an anesthetic, can do it. Diffuse electrical discharge like during a seizure can also cause it. ...Read more