Transient Vision Loss - An Eye Emergency

Introduction

Transient vision loss, also called Amaurosis fugax, is a condition in which a person experiences a temporary loss of vision in one or both eyes. It is not necessarily a complete loss of vision; instead, it can be blurred vision or like looking through a veil. Any such sudden vision loss is an emergency. This condition can be treated by managing the underlying chronic condition. Read the article to learn more.

What Is Meant by Transient Vision Loss?

Transient vision loss or amaurosis fugax is a temporary and painless vision loss seen in one (monocular) or both (binocular) eyes. This condition is caused by cutting down the blood flow to the retina. The retina forms a layer of cells at the back of the eye that alters light into electrical signals that help the brain convert it into images. The vision loss can be complete or partial and can happen in one or both eyes. This is a medical emergency, and it can be caused due to various reasons.

Even if vision returns to normal, there can be signs of serious abnormalities in the eye, brain, etc. When the underlying cause is not diagnosed and treated on time, it can result in permanent vision loss or even brain stroke. Undergoing eye examination is very important, as diagnostic methods can narrow down the causes.

Why Is Transient Vision Loss an Emergency Situation?

If the vision loss is caused by a blood clot that blocks the blood flow to the eye or brain, this situation is treated the same way as a transient ischemic attack or stroke. If the doctors suspect a blood clot resulting in transient vision loss in the emergency room, they recommend performing other tests. These may include:

• MRI (magnetic resonance imaging) test of the brain.

• Blood vessels imaging of the neck and head.

• Blood tests.

• Cholesterol levels and heart rhythms are monitored.

• Echocardiogram (ultrasound of the heart).

Analyzing the results of these tests can help the doctor provide proper treatment for vision loss, which can prevent further damage to the vision and the brain. In some cases, medication to manage blood clots, such as Aspirin, can be recommended, while in some, surgery will be performed to eliminate the blood clot, and the placement of a stent is done.

What Are the Causative Factors of Transient Vision Loss?

Some common causes are:

• Blood clot formation.

• Blood vessel inflammation is called vasculitis.

• Blood vessel malformation.

• Formation of tumors in the eye socket.

• Dry eyes.

• Optic nerve swelling.

• Spasms of muscle are present in the eyes.

• Angle-closure form of glaucoma.

• Atherosclerosis is a condition where there is a breakdown of plaque from its original location.

The doctor will examine for other conditions that may have similar symptoms as transient vision loss; these are:

• A transient ischemic attack is a stroke that lasts for only a few minutes.

• Stroke.

• Giant cell arteritis is inflammation caused in some arteries.

• Multiple sclerosis is a chronic condition that affects the central nervous system.

• Traumatic brain injury is a brain dysfunction due to outside force.

What Are the Symptoms of Transient Vision Loss?

The symptoms of transient vision loss include complete or partial vision loss in one or both eyes. This condition does not cause any pain. It may appear like a curtain is falling from the top of the eye. It is a temporary condition and resolves on its own. Sudden vision loss must be treated immediately, whether painful or not.

How Is Transient Vision Loss Diagnosed?

Initially, the doctor will review the patient's medical history and symptoms. Then, a complete eye exam will be performed. The patient will be asked whether the vision loss was unilateral or bilateral. The doctor may review other features, including any trigger or precipitating factor, the duration of the entire episode, complete or incomplete resolution, and any symptoms after the episode, all contributing to the diagnosis.

What Information Is Important to Share With the Doctor During Diagnosis?

• Any history of conditions that affect blood vessels like diabetes, increased blood pressure, smoking, abnormal blood clots, etc.

• Any prior history of stroke, heart attacks, blood vessels narrowing in the neck region, etc.

• Any other eye condition, like glaucoma or prior episode of vision loss.

• Temporary episode of prior neurological symptoms.

• History of migraine.

• If the person is over 50, then symptoms such as headache, jaw pain, scalp tenderness, loss of appetite, double vision, etc., need to be reviewed.

How Is Transient Vision Loss Managed?

The treatment for transient vision loss usually depends on the cause of the condition. Some causes, such as stroke, need immediate treatment. Other causes, such as giant cell arteritis, will have their own method of treatment.

What Is the Prognosis or Outcome of Transient Vision Loss?

The outlook for transient vision loss depends on the cause of the condition. Getting immediate medical care is very important, especially in conditions such as stroke. Transient vision loss is a temporary condition. However, those underlying conditions that result in sudden vision loss need to be treated. If this is caused by conditions like giant cell arteritis or multiple sclerosis, then the person needs to follow the treatment instructions given by the doctor. By treating the underlying cause, transient vision loss can also be managed.

How Can Transient Vision Loss Be Prevented?

Although transient vision loss cannot be prevented, managing the underlying cause can lower the risk of this condition.

How Can the Risk of Transient Vision Loss Be Reduced?

The risk of this condition can be reduced by

• Managing chronic conditions such as diabetes, high blood pressure, increased cholesterol, etc.

• Intake of healthy and proper diet food.

• Maintaining a healthy weight.

• Quit smoking.

• Reduced intake of alcohol.

• Regular exercise.

Conclusion

Transient vision loss is a sudden vision loss in one or both eyes. This condition is painless but an emergency. Although vision loss will be experienced only for some time, the cause can be serious. This condition can be treated by managing underlying health conditions such as stroke, heart conditions, diabetes, high blood pressure, etc. It cannot be prevented but handled by treating the underlying cause.