why do our eyes twitches sometimes ?

Eye Twitching

Eye twitching is a repetitive, uncontrollable blinking or spasm of the eyelid, usually the upper lid.
Eye twitching (blepharospasm) usually affects the eye muscles of both eyes. If you have eye twitching, you may have an involuntary movement that recurs every several seconds for a minute or two.

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Most people develop a minor eyelid twitch at some point in their lives. The causes include:

• Fatigue
• Stress
• Caffeine

This minor form of twitch is painless and harmless. It usually goes away on its own. But it can be quite annoying. And that's especially true if the spasms are strong enough to cause the eyelids to completely close shut before they reopen.
In some cases eye twitching is more than a temporary nuisance. Some people have spasms that occur frequently throughout the day. Symptoms can recur for days, weeks, or even months. That can cause a lot of emotional distress. It can interfere with quality of life.
In its most serious forms, which are relatively uncommon, eye twitching can become chronic. It can cause persistent winking and squinting. If it progresses to the point where you have difficulty keeping your eyes open, it can cause severe vision impairment.
Sometimes, eye twitching can be a sign of eye conditions such as:

• Blepharitis (inflammation of the eyelids)
• Dry eyes
• Light sensitivity
• Pinkeye

 More rarely, it can be a sign of a brain or nerve disorder, such as:

• Bell's palsy
• Dystonia
• Parkinson's disease
• Tourette's syndrome

Eye twitching can also be a side effect of certain medications. The most common offenders include drugs used in the treatment of psychosis and epilepsy.
See your eye doctor for a complete exam if you develop:

• Twitching or spasm around your eyes
• Facial spasms that last longer than one week

Types of Eye Twitching

There are three common types of eye twitch:

• Minor eyelid twitch
• Benign essential blepharospasm
• Hemifacial spasm

Minor eyelid twitch is often associated with lifestyle factors, such as:

• Fatigue
• Stress
• Lack of sleep
• Use of alcohol, tobacco, or caffeine

Minor eyelid twitch also can be caused by irritation of the surface of the eye (cornea) or the membranes lining the eyelids (conjunctiva).
Sometimes the cause of minor eyelid twitch cannot be identified. In almost all cases it is painless and harmless.
Benign essential blepharospasm usually develops in mid- to late-adulthood and gradually worsens. It affects about 20,000 to 50,000 Americans. It's twice as common in women as in men.
Typically, benign essential blepharospasm starts with excessive blinking and/or eye irritation that may be triggered by:

• Fatigue
• Stress
• Irritants such as bright light, wind, or air pollution

As the condition worsens, it may lead to an increased sensitivity to light, blurry vision, and facial spasms. In severe cases, the spasms can become so intense that the eyelids stay shut for up to several hours.
Researchers believe that benign essential blepharospasm may result from a combination of environmental and genetic factors. Although the condition is usually random, it sometimes runs in families.
Hemifacial spasm is quite rare and involves more than just the eyelid muscles. It also usually involves the muscles around the mouth. Unlike other types of eyelid twitching, it usually affects only one side of the face.
In most cases, hemifacial spasm is caused by an artery pressing on the nerve to the facial muscles.