慧眼眼科专科诊所

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Prevent the Glaucoma



What Is Glaucoma?
 
Very high pressure in one or both eyes can harm the optic nerve and cause vision loss.

Glaucoma is an often painless but serious eye condition that causes damage to your optic nerve.

This nerve connects your eye to your brain, allowing you to see.

The condition can cause blindness. In fact, glaucoma is the second leading cause of blindness in the world.

Glaucoma Risk Factors

The top risk factor for glaucoma is having high pressure within your eye.

Other important risk factors include:

  1. Older age
  2. African ancestry
  3. Thin corneas (the clear layer at the front of the eye)
  4. Family history of glaucoma
  5. Nearsightedness
  6. Previous eye injuries
  7. Steroid use
  8. History of shock or anemia

What Causes Glaucoma?
 
One known cause is the optic nerve becoming compressed due to high pressure within the eye.

Another cause can be reduced blood flow within the optic nerve.

But even people with normal eye pressure can develop glaucoma.

In addition to high eye pressure, high blood pressure can also lead to optic nerve damage

Unfortunately, glaucoma has no obvious warning signs and causes no pain.

And once damage to your eyesight has occurred, it’s permanent.

With an early diagnosis, though, you may be able to delay the progression of the disease.

What is Intraocular Pressure?

Within healthy eyes, there's a clear fluid called aqueous humor that circulates to nourish the eye and its various parts.

This fluid normally drains out of the eye.

When drainage is slowed, pressure within the eye (called intraocular pressure) can build up and harm the optic nerve by compressing it.

The optic nerve is vital to your ability to see.

It carries signals from the retina in the eye to the brain.

When your optic nerve's fibers are damaged, such as by high intraocular pressure, blind spots can develop in your field of vision.



Types of Glaucoma

There are several different kinds of glaucoma, including:

Open-angle glaucoma: 

This is the most common form of glaucoma.

It occurs when the eye's fluid passes too slowly through the open drainage "angle" where the eye's cornea and iris meet.

The first sign of a problem with this type of glaucoma is usually the loss of your peripheral (side) vision.

You may compensate, without knowing it, by turning your head to the side to see things.

You may not realize you're losing your vision until the loss is severe.

Low-tension or normal-tension glaucoma: 

O
ptic nerve damage occurs even though your eye pressure is normal.

Your doctor can prescribe medications that can lower your eye pressure by 30 percent, which slows the disease's progression in some people.

But glaucoma can also worsen despite these treatments.

Angle-closure glaucoma: 

Formerly called narrow-angleglaucoma, this urgent medical emergency occurs when the drainage angle closes due to being blocked by part of your eye's iris.

Eye pressure builds suddenly when fluid can't drain from your eye.

With this type of glaucoma, you'll experience severe pain and nausea. Your eye will redden and your vision will blur.

It's very important to seek emergency treatment immediately at a hospital or clinic. Without treatment, you could lose sight in the affected eye.

Congenital glaucoma: 

Babies can be born with a defective angle in the eye that doesn't allow fluid to drain properly.

The symptoms of congenital glaucoma are usually quite noticeable.

Children with the condition may have a cloudy eye, be very sensitive to light, or produce an excess of tears.

Your child's doctor will likely recommend a surgical procedure to correct the problem.

The procedure is considered safe and effective. When done early in life, it offers children an excellent chance of having good vision.