People may suffer from visual impairment even though their eyes are perfectly normal. Such loss of vision may result from neurological impairment.

Vision is the combination of image formation and perception of various attributes of the image by the brain. When the brain is not able to perceive images or various attributes of images, the patient may suffer from neurological impairment of vision. Such impairment owes its origin to the nervous system.

Causes of Visual Impairment:

There are various areas in the brain that process some or the other attribute of the image that has formed on the retina. Occipital cortex, the area situated at the rear side of the brain is a very important site. It is responsible for processing visual stimuli and allowing people to make an idea about shape, distance, movement, color, etc. The severity of loss of vision depends on the extent and location of damage in the brain.

Neurological loss of vision may result from acquired brain injury, difficulties with visual perception, impairment in coordination of the eyes, etc. All these may stem from damage areas in the brain that are responsible for vision. There are many areas in the brain that are responsible for vision.

These areas can get damaged from various accidents like:

Stroke: If a person suffers a stroke, a part of his or her brain is likely to get damaged due to a haemorrhage or a blocked blood vessel.

Traumatic Brain Injury: A traumatic brain injury such as in a car accident or a violent fall can damage visual perception of the brain.

Infections: Infections such as meningitis attack the brain and may impair various areas of it.

Lack of Oxygen: People may suffer from lack of oxygen if they experience accidents like a near-drowning episode or a heart attack or something else, which has the effect of interrupting blood flow to the brain.

Diseases: Diseases such as brain tumors, multiple sclerosis etc. can precipitate neurological vision loss.

Symptoms of Visual Impairment:

Symptoms of neurological vision loss depend on the type of vision impairment and the location of damage in the brain. It may include:

Blurry vision: In Blurry vision, a person will not see things clearly or may see something in light but find it difficult to see them in dim light.

Double vision: In double vision, the patient sees a single object as two and cannot merge them as one.

Problems with depth perception of objects

Problem with bright light: In this type of problem, a person experiences difficulty seeing an object in a bright light. One may also feel pain or discomfort in the eye in bright light.

Difficulty with interpreting the object the person is looking at

Partial loss in the visual field: In this problem, half of the visual field in each eye is missing.

Treatment of Visual Impairment:

There is hardly any treatment for such vision loss since the rectification of visual acuity is of no help. Depending on the location and degree of neurological impairment, vision may improve over time. Some children with acquired brain injury or impairment in the coordination of the eyes and difficulties with visual perception also tend to improve with age.

Conclusion:

This is a type of vision loss where glasses, contact lenses, surgeries, or eye drops are not going to help. Such vision loss is usually permanent. Children with similar symptoms need to be presented with pictures, bright light, etc., which may help to form an idea about the object.

Visual Impairment Related To Nervous System!

Eye Strain is an umbrella term that denotes a number of symptoms that relate to the extended use of eyes as well as discomfort that may come from excessive smartphone and computer use. This condition may or may not lead to significant eye damage and is usually characterised by blurry vision, headaches and a feeling of dryness in the eye as you blink less which creates less tears. This may happen due to the extended use of the eye when you are following objects on a screen or staring at a screen for too long. So, is eye strain the cause of your headaches? 

Find out more in this article.

Causes: Eye Strain or Asthenopia is caused by concentrating on visually intense tasks like reading from texts that have a fine print, the use of computers and other screens for prolonged periods, and trying to focus on objects in the dark. This can lead to distress of the muscles in this area which can also cause eye strain leading to a variety of symptoms including double imagery and even headaches and mild migraine like conditions.

Eye Muscle Imbalance: When there is eye strain which leads to headaches, it can also give rise to eye muscle imbalance which makes it difficult to concentrate with both eyes at the same time. In such cases, one may need bifocal glasses so as to fix the issue and prevent such debilitating headaches to remain on a persistent basis.

Diagnosis: Digital eye fatigue and ocular eye strain leading to headaches can be diagnosed by a doctor with the help of regular eye examinations. In any case, one should have the eyes checked at least once a year. This is especially important if your job involves sitting in front of the computer screen for prolonged hours.

Symptoms: There are a variety of symptoms of these headaches that are caused by eye strain. Apart from blurry vision which does not allow the patient to see properly and clearly without glasses, it can also cause headaches with symptoms like nausea and sensitivity to light. Retinal or eye migraines do not necessarily have to come with headaches, but the pressure can be painful enough.

Treatment: To begin with, the best form of treatment for headaches born from eye strain includes prevention which can be done by getting plenty of rest and sleep even as we limit the hours spent in front of the screen. One can also lower the resolution of the screen and make it more ambient. Also, the screen should be placed at a considerable distance from the eyes. The doctor can also prescribe glasses and eye drops for better eye lubrication.

Headache - Can Eyestrain Be the Reason Behind it?

What crying does to your body

Do you know that every little activity that you perform on a daily basis impacts your body? what you eat, how long you sleep and even every tear you shed affects your body. Most people are aware of how their body reacts to major activities, like exercising, but few are aware of how the body reacts when they cry.

While you are generally concerned with the mental cause and effect of crying, have you thought about what crying does to you physically? tears are not always shed when a person is upset. Tears are a body's way of expressing itself as well as protecting itself. Everything from a happy ending in a movie to a dust particle in the eye can make you tear up.

There are essentially three kinds of tears. Basal tears and reflective tears help keep the eyes lubricated and irritant free respectively. It is the psych tears, which we commonly refer to as crying, that come as emotional responses.

Crying might be a sign of emotional stress and pain but if you are wondering how it harms your body, the answer is that it does not. Crying does not harm one's body physically. In fact it does better than harm to your body, purely physically speaking. Here's how-

- when you cry, your tears help your eyes remain clear.

- it also has anti-bacterial properties that keep your eyes clean.

- your eyes remain properly hydrated thus reducing any kind of irritation. You might feel dehydrated after a while due to the loss of water and salt.

- even the excess manganese in your body gets washed out through tears.

But for some, the act of crying can cause medical complications. It can lead to fits or can cause an acute shortness of breath. For those with severe heart conditions, there can be a cardiac pain. Crying can take a toll on your body if you have certain medical conditions. For most people crying does more good for their body than harm.

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Related Tip: Why India Has POOREST Eyesight? + 4 Tips for Improving Your Eyesight

What Does Crying Do to Your Body | Good & Bad Effects

Bloodshot eyes aren't exactly the best feature of a person! When a person's eyes are bloodshot, it is quite easy to 'see' that something is wrong! Eyes are possibly the most delicate organs of the body, and are all the more vulnerable to infections such as 'subconjunctival haemorrhage'. However, as dour as such terms may sound, there is a lot which really should be known about them!

The eye has a thin layer which goes by the name of the conjunctiva, which covers a part called the sclera. Many a times, especially in the case of children, if an injury unfortunately occurs in the eye, there are chances that it may form subconjunctival haemorrhage.

The reason why this occurs is that there are some of the very small blood vessels in a person's eye break. The reason for this, apart from an injury could also be on account of a sudden increase in the blood pressure of the person. This usually takes place due to some very strenuous lifting exercise but also can occur due to laughing or sneezing!

The occurrence of a subconjunctival haemorrhage can also be closely linked to the consumption of pills which thin the blood such as aspirin.

Treating Subconjunctival Haemorrhage

Now, considering the fact that such a haemorrhage has the potential to look quite scary, it may be natural for a person to react proactively. However, in many cases this is not required at all. As a matter of fact, the issue clears up within a couple of weeks at the maximum and a week and a half, on average. If this does not happen to be the case, it is a signal that a medical professional should take a look at the patient's eye.

In many instances, a person may not even get to know that he or she is suffering from a subconjunctival haemorrhage as there is no effect on the vision of the person and he or she would probably get to know that this is the case by taking a look in the mirror or being informed of his or her eye looking red.

In order to treat a subconjunctival haemorrhage in an effective manner, the first thing to be done by a person is to avoid any medication which could be causing it. Also, it is quite important not to rub one's eye as this really does slow down the healing process.

Artificial tears help soothe the eye but they do not hasten the rate of repair. A subconjunctival haemorrhage may occur, but if a person follows the right steps, his or her vision can consistently remain 20/20!

All About Subconjunctival Haemorrhage

Cataract can be defined as the clouding of the natural lenses in the eyes. This is caused by the clumping of protein in the eye lens. Cataract is a common eye disorder and the leading cause of loss of vision in people who are past their fortieth birthday. Cataract can occur in one or both eyes. When diagnosed properly, cataract can be treated with surgery to prevent blindness.

Depending on where and how they develop, there are many types of cataract. The most common amongst these are:

1.        Subcapsular cataract

These occur at the back of the eye lens. Diabetic patients are very susceptible to this kind of cataract.

2.        Nuclear cataract

Yellowish-brown cataract that form in the center of the lens are called nuclear cataract. This is usually seen in cataract caused by ageing.

3.        Cortical cataract

Cataract in the lens cortex are known as cortical cataract. These are wedge shaped and whitish in color. Spokes protruding out of these opaque wedges can be seen moving towards the center of the eye.

4.        Congenital cataract

Though they are not common, babies can also have cataract. Cataract formed at birth or within the first year of a baby's birth are known as congenital cataract.

5.        Secondary cataract

Cataract is one of the known side effects of diabetes and glaucoma. Some steroids and medicines are also linked to cataract.

6.        Traumatic cataract

If your vision becomes cloudy years after an eye injury, it could be a traumatic cataract. It can take several years for this to happen.

7.        Radiation cataract

Exposure to radiation can also lead to cataract. This is seen sometimes in patients who have undergone radiation therapy to fight diseases like cancer.

Though the type of cataract might differ from person to person, the symptoms are usually the same. Some of the common symptoms of cataract are:

1. Blurred vision
2. Reduced night vision
3. Increased sensitivity to light and glare
4. Seeing halos around lights
5. Colors appearing faded
6. Double vision

A reading test is the first step towards diagnosing cataracts. This is followed by tests to measure the eye pressure. Your doctor will also need to dilate the pupil to check the condition of the optic nerves and retina.

Surgery is the safest way to remove a cataract. Surgery is usually recommended when cataract begin inhibiting your daily life such as preventing you from driving, interfering with reading etc.
 
In most cases, this can be done as an outpatient procedure. The earlier it is diagnosed, the easier it is to treat. Hence, if you notice any of the symptoms mentioned above, get your eyes checked at once. The surgery is a day-care surgery only, so a person can go home the same day.

Is Your Vision Clouded? It Could Be Cataracts

A person is said to have great vision more in the metaphorical way than in the literal sense. However, having both is just so important, especially as the ability to see reduces as a person gets older. Old age comes with its own set of problems, and vision loss is one of them. If kept in check from an early age, however, vision loss can be deferred indefinitely.

While a person's eyesight is likely to deteriorate over the course of his life, there is a lot which can be done in an effort to make sure that this is not the case. To start with, it makes good sense to be regular with eye check-ups. After a person attains the age of sixty, he or she should have a doctor take a look at his or her eyes on a yearly basis. There is no point trying to conserve eye sight if a person is too late in taking corrective action. By paying a visit to the ophthalmologist, a person will get to know the exact problem that he is suffering from.

A good diet which is rich in the nutrients which improve a person's eye sight does go a very long way in the long run. A person should make sure that is diverse enough to take care of the needs of a person and should include grapefruit, strawberries as well as berries and nuts.

One of the main things which can be done in order to preserve the health of a person's eyes until he or she reaches an advanced age is to stop smoking in all forms. As a matter of fact, tobacco leads to cyanide entering the blood stream and this does a lot of damage to the eyes. In fact, quite a few irreversible conditions of the eye are caused due to this.

Exercise is said to be good for a person at any age for a variety of reasons and it is really good for even the eyes, though the link may not be immediately so clear. It reduces the risk of age related degeneration by up to 70 per cent!

What is really interesting about a person's eyes is that they can be signs of trouble in other parts of the body. For example, if a person has blurry vision, they should get checked for diabetes. Also, eyes which do not produce enough natural lubrication can show a risk of rheumatoid arthritis and perhaps even thyroid disease.

All in all, a person's eyesight is so crucial to his or her overall health and wellbeing. We have only one pair of eyes, so we might as well take care of them!

Tips to Prevent Vision Loss in Elderly People

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