What is Hemianopia | Hemianopia Definition
Hemianopia is partial blindness and in medical terminology, it is also known as hemianopsia. The word is derived from the amalgamation of two Greek words, HEMI, and OPSIA which means without half vision respectively. By combining all these their words together, hemianopsia implies without half vision.
In this condition, half of the vision of the affected person becomes defective. The affected persons can either become permanently blind or the vision might get partially diminished. It often results due to tumor, head trauma or in case a person who is suffering from a stroke may encounter this disease.
This condition is also observed in people suffering from a migraine, however, this problem lessens as the magazine gets over. Based on the condition, there can be two types of hemianopia, and it can be temporary or permanent.
What are the types of Hemianopia?
Well, hemianopia can be of different types, it depends on the parts of the brain involved. Our brain has two parts :
- THE LEFT SIDE – This part of the brain receives information from both eyes, reads it and analyze it, and send back the information to the right side of the visual world.
- THE RIGHT SIDE – This part of the brain receives information from both eyes, read and analyze it and sends signals to the left side of the visual world.
Optic nerve played a key part in transmitting these signals from the brain and connected it to the optic chiasm. Harm to either side of the mind or these nerve pathways can cause diverse kinds of hemianopia:
This type impacts the same side of each eye, for example, the affected person with homonymous hemianopia might not be able to see from the right side of both the eyes. It is known as right homonymous hemianopia.
This composes impacts on different sides of each eye. For instance, the person suffering from heteronymous hemianopia might not be able to see from the right side of the left eye and left side of the right eye. Heteronymous hemianopia is of two types:
in this kind, the loss of vision usually takes place in the area near to the nose. It results because of lateral damage to the retinal nerve fibers.
In this case, the person loses vision from the area of the eye which lies close to the temple. This results because of damage or lesions to the optic chiasm.
This results because of damage in one quadrant or portion of the visual field. It is dependent on the part of the brain that gets damaged. The area which is connected to the damaged portion of the brain will suffer from complete or partial hemianopia.
What are the Hemianopia causes?
Hemianopia is a condition which results due to damage to the brain which is responsible for analyzing the image received via optic nerves. There can be various factors that can cause this disease, some of which include brain injuries, strokes that occur in a certain part of the brain and physical head trauma.
As its already mentioned above that sometimes migraine can also result in hemianopia but that’s partial, it subsidizes when a migraine gets over. Here are the common reasons that cause hemianopia:
Stroke: It is one of the most common reasons for hemianopia. Strokes are a result of the insufficient supply of oxygen to the brain. Oxygen is responsible for the seamless functioning of the cranial system. Strokes can prove to be fatal, and it may result in physical, and mental illness and hemianopia is one of them.
Brain injuries: It is one of the common cause of hemianopia. Blunt force trauma resulting from sports injuries or accidents which gets accumulate over a prolonged period may lead to this disease.
Brain tumors: Another reason for hemianopia is brain tumors. When tumor begins to grow in the brain the damaging effects of it are similar to traumatic brain injuries thus resulting in hemianopia of one eye or both the eyes. If hemianopia is because of a brain tumor, your vision may return after removal of the tumor.
Apart from the disease mentioned above, any kind of damage to the nerves or the cerebrum may result in this diseases, some of the other reasons for the same include :
- Alzheimer’s illness
- Different sclerosis
- Shaken infant disorder
- High weight in the cerebrum
- Carotid corridor aneurysms
What are the Hemianopia Symptoms?
As the name hemianopia means that it affects the partial or complete vision of the affected person, blindness is the most prominent symptoms of this diseases. However, there are other symptoms that you must know so that you can get this disease cured on time.
- Mutilated Vision – As mentioned above, this is the most prominent symptom of diseases, damaged or mutilated vision. Where the person cannot see properly.
- The affected person loses peripheral. It may happen on one side or the face or on both sides of the face.
- The person suffering from hemianopia keeps on bumping into people or objects as they cannot comprehend the vision and distance.
- Based on the area affected, the hemianopia bars the vision of the people or objects on the side of the face.
- Loss of visual awareness.
- The person is not able to process the entire sentence, word or phrase because of the disturbed vision.
- Visual hallucinations, this is also one of the symptoms of this disease, since the partial vision of the person is affected, they cannot see the objects, and sometimes they may see things which are not exactly there because of the lighting effect.
How is Hemianopia analyzed?
The eye specialists conduct certain tests which help you know what kind of hemianopia you are suffering from. Generally, it involves a standard eye exam which includes a field exam. This will enable your specialist to decide how well your eyes can center around particular objects.
Contingent upon the consequences of your exam, your specialist may likewise investigate the back of your eye with imaging tests. They may also conduct the eye pressure test in which the doctor shoots short bursts of air into your eye to check the pressure within the eyes. These tests will enable your specialist to preclude other conceivable reasons for your vision issue.
Keep in mind, hemianopia results because of damage to the brain and not eyes. So, your doctor will advise you for a brain scan and total blood count test. This is done to decipher the exact reason for the problem.
Why should you be worried?
In some cases hemianopia never gets cured, under such condition you may opt for the following measures:
- wearing prismatic correction glasses in case you have double vision
- You may also opt for vision compensatory training so that you can use your remaining vision more efficiently.
- Vision restoration therapy also helps people suffering from hemianopia.
Treatment for Hemianopia
Well, any kind of disease is a matter of worry especially when it comes to visual impartation. Hemianopia can be a serious condition. If not diagnosed and rectified it may result in a permanent visual defect.
Treatment for hemianopia depends upon the cause. In Case it is caused by a stroke or head damage it may take months to overcome this condition.
Simulation training of Audio-Visual:
This type of treatment is usually given to people suffering from homonymous hemianopia. In this treatment, people are made to work up in their visual and audio senses and are trained to make them use both these senses in sync and effectively.
Use of specialized glasses developed for hemianopia:
In this treatment, a specialized glass which is also known as Optical visual span expanders. The glasses are prepared by taking into consideration the level of hemianopia in the person. These glasses have prisms in their lens which helps in expansion of the visual field.
Explorative saccade training:
This treatment is also famously known as scanning therapy. In this treatment, the optometrist observes how eyes move from one focal point to another. There is also an eye pressure test which is done. In this case, short bursts of air are shot into the eyes.
Hemianopia can be a baffling condition since it makes daily activities like running, reading, etc., so difficult for the people. In certain cases, hemianopia can be troublesome, although, in certain conditions, it might settle down in a few months while in some instances it can become a permanent disease.
You can take the advice of your specialist about it so that the person can help you overcome the condition. Moreover, proper guidance and information will help you use your remaining vision effectively and efficiently.