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cataract ( ต้อกระจก ) article


A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. The lens works much like a camera lens, focusing light onto the retina at the back of the eye. The lens also adjusts the eye's focus, letting us see things clearly both up close and far away.

The lens is mostly made of water and protein. The protein is arranged in a precise way that keeps the lens clear and lets light pass through it. When we get older, the protein may clump together and make the lens cloudy. This is a cataract, and over time, it will get more and more, making it diificult to see through  .

Cataracts are classified as one of three types:

  • A nuclear cataract is most commonly seen as it forms. This cataract forms in the nucleus, the center of the lens, and is due to natural aging changes.
  • A cortical cataract, which forms in the lens cortex, gradually extends its spokes from the outside of the lens to the center. Many diabetics develop cortical cataracts.
  • A subcapsular cataract begins at the back of the lens. People with diabetes, high farsightedness, retinitis pigmentosa or those taking high doses of steroids may develop a subcapsular cataract.

Cataract Symptoms and Signs

A cataract starts out small, and at first has little effect on your vision. You may notice that your vision is blurred a little, like looking through a cloudy glass or viewing an impressionist painting. A cataract may make light from the sun or a lamp seem too bright or glaring. Or you may notice when you drive at night that the oncoming headlights cause more glare than before. Colors may not appear as bright as they once did.

Blurred or hazy vision may indicate a cataract.

Hazy or blurred vision may indicate a cataract.

A cataract is a clouding of the eye's natural lens. Click here for animation. Click here for animation of how a cataract affects vision.

A cataract is a clouding of the eye's natural lens.

Cataracts affect vision by scattering incoming light.  

The type of cataract you have will affect exactly which symptoms you experience and how soon they will occur. When a nuclear cataract first develops it can bring about a temporary improvement in your near vision, called "second sight." Unfortunately, the improved vision is short-lived and will disappear as the cataract worsens. Meanwhile, a subcapsular cataract may not produce any symptoms until it's well-developed.

If you think you have a cataract, see an eye doctor for an exam to find out for sure.

What Causes a Cataract?

No one knows for sure why the eye's lens changes as we age, forming cataracts. Researchers are gradually identifying factors that may cause cataracts — and information that may help to prevent them.


Many studies suggest that exposure to ultraviolet light is associated with cataract development, so eyecare practitioners recommend wearing sunglasses and a wide-brimmed hat to lessen your exposure. Other types of radiation may also be causes. For example, a 2005 study conducted in Iceland suggests that airline pilots have a higher risk of developing nuclear cataract than non-pilots, and that the cause may be exposure to cosmic radiation. A similar theory suggests that astronauts, too, are at risk from cosmic radiation.

Other studies suggest people with diabetes are at risk for developing a cataract. The same goes for users of steroids, diuretics and major tranquilizers, but more studies are needed to distinguish the effect of the disease from the consequences of the drugs themselves.

Some eyecare practitioners believe that a diet high in antioxidants, such as beta-carotene (vitamin A), selenium and vitamins C and E, may forestall cataract development. Meanwhile, eating a lot of salt may increase your risk.

Other risk factors include cigarette smoke, air pollution and heavy alcohol consumption. A small study published in 2002 found lead exposure to be a risk factor; another study in December 2004, of 795 men age 60 and older, came to a similar conclusion. But larger studies are needed to confirm whether lead can definitely put you at risk, and if so, whether the risk is from a one-time dose at a particular time in life or from chronic exposure over years.*


Cataract Treatment

When symptoms begin to appear, you may be able to improve your vision for a while using new glasses, strong bifocals, magnification, appropriate lighting or other visual aids.


This intraocular lens or IOL is used to replace the cataract patient's clouded natural lens.

An intraocular lens (IOL) is implanted in the eye in place of the patient's clouded natural lens. Shown is Alcon's new AcrySof Natural IOL; the lens material is yellow because it filters out blue light, which may be harmful to eyes.

Think about surgery when your cataracts have progressed enough to seriously impair your vision and affect your daily life. Many people consider poor vision an inevitable fact of aging, but cataract surgery is a simple, relatively painless procedure to regain vision.

Cataract surgery is very successful in restoring vision. In fact, it is the most frequently performed surgery in the United States, with more than 3 million Americans undergoing cataract surgery each year. Nine out of 10 people who have cataract surgery regain very good vision, somewhere between 20/20 and 20/40.

During surgery, the surgeon will remove your clouded lens, and in most cases replace it with a clear, plastic intraocular lens (IOL). New IOLs are being developed all the time to make the surgery less complicated for surgeons and the lenses more helpful to patients. Presbyopia-correcting IOLs potentially help you see at all distances, not just one.(see details in Multifocal IOL or Acrysof Restor ) Another new type of IOL blocks both ultraviolet and blue light rays, which research indicates may damage the retina

The small incision cataract surgery now is very successful.We use the ultrasound to emulsify the lens (make it soft )and suction it out through small wound (only 3mm) an put the foldable intraocular lens in.The wound can close spontaneous after operation without any stitches.We can do under topical anesthesia ( only anesthetic eyedrop ) if the patient can cooperate with the surgeon and do not need to close with eyepad back home.In some cases,the patients can not control their eye movement,we can inject local anesthesia around the eye that we will do the operation.The patients will feel numb and can  not move their eyes while we do the operation.In this case we will close the eye for a few hours after operation.After that the patients can open their eyes at home ,drop the madication and use their eyes as usual .

    After operation,the patients should keep their eyes from water,don't wash their face for about a week and no swimming for about 2-3 weeks.The patients should wear sunglasses when they go outside and continue the medication for a few week after operation .

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