Ho Optometrist

Your Local Optometrist from 怡保……Ipoh….. Perak, Malaysia

Runner Alex Flynn featured in Running Fitness magazine wearing his Polaroids

Runner Alex Flynn featured in Running Fitness magazine wearing his Polaroids.

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Cataract…… can’t run… can’t hide

What is a cataract?

A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans have either a cataract or have had cataract surgery. A cataract can occur in either or both eyes. It cannot spread from one eye to the other.

What is the lens?

The lens is a clear part of the eye that helps to focus light, or an image, on the retina. The retina is the light-sensitive tissue at the back of the eye.

In a normal eye, light passes through the transparent lens to the retina. Once it reaches the retina, light is changed into nerve signals that are sent to the brain.

The lens must be clear for the retina to receive a sharp image. If the lens is cloudy from a cataract, the image you see will be blurred.

 How do cataracts develop?

Age-related cataracts develop in two ways:

1. Clumps of protein reduce the sharpness of the image reaching the retina. The lens consists mostly of water and protein. When the protein clumps up, it clouds the lens and reduces the light that reaches the retina. The clouding may become severe enough to cause blurred vision.

Most age-related cataracts develop from protein clumpings. When a cataract is small, the cloudiness affects only a small part of the lens.You may not notice any changes in your vision. Cataracts tend to “grow” slowly, so vision gets worse gradually.

Over time, the cloudy area in the lens may get larger, and the cataract may increase in size. Seeing may become more difficult.Your vision may get duller or blurrier.

2. The clear lens slowly changes to a yellowish/brownish color, adding a brownish tint to vision. As the clear lens slowly colors with age, your vision gradually may acquire a brownish shade.

At first, the amount of tinting may be small and may not cause a vision problem. Over time, increased tinting may make it more difficult to read and perform other routine activities. This gradual change in the amount of tinting does not affect the sharpness of the image transmitted to the retina.

If you have advanced lens discoloration, you may not be able to identify blues and purples.You may be wearing what you believe to be a pair of black socks, only to find out from friends that you are wearing purple socks.

Who is at risk for cataract?

The risk of cataract increases as you get older. Other risk factors for cataract include:

  • Certain diseases (for example, diabetes).
  • Personal behavior (smoking, alcohol use).
  • The environment (prolonged exposure to ultraviolet sunlight).

What are the symptoms of a cataract?

The most common symptoms of a cataract are:

  • Cloudy or blurry vision.
  • Colors seem faded.
  • Glare. Headlights, lamps, or sunlight may appear too bright. A halo may appear around lights.
  • Poor night vision.
  • Double vision or multiple images in one eye. (This symptom may clear as the cataract gets larger.)
  • Frequent prescription changes in your eyeglasses or contact lenses. These symptoms also can be a sign of other eye problems.

If you have any of these symptoms, check with your eye care professional.

Are there other types of cataract?

Yes. Although most cataracts are related to aging, there are other types of cataract:

• Secondary cataract.

Cataracts can form after surgery for other eye problems, such as glaucoma. Cataracts also can develop in people who have other health problems, such as diabetes. Cataracts are sometimes linked to steroid use.

 • Traumatic cataract.

Cataracts can develop after an eye injury, sometimes years later. 4 • Congenital cataract. Some babies are born with cataracts or develop them in childhood, often in both eyes. These cataracts may be so small that they do not affect vision. If they do, the lenses may need to be removed. • Radiation cataract. Cataracts can develop after exposure to some types of radiation.

How is a cataract detected?

Cataract is detected through a comprehensive eye exam that includes:

  • Visual acuity test. This eye chart test measures how well you see at various distances.
  • Dilated eye exam. Drops are placed in your eyes to widen, or dilate, the pupils.Your eye care professional uses a special magnifying lens to examine your retina and optic nerve for signs of damage and other eye problems. After the exam, your close-up vision may remain blurred for several hours
  • Tonometry. An instrument measures the pressure inside the eye. Numbing drops may be applied to your eye for this test.

Your eye care professional also may do other tests to learn more about the structure and health of your eye.

How is a cataract treated?

The symptoms of early cataract may be improved with new eyeglasses, brighter lighting, anti-glare sunglasses, or magnifying lenses. If these measures do not help, surgery is the only effective treatment. Surgery involves removing the cloudy lens and replacing it with an artificial lens.

 

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2012 龙年….新年快乐!!!

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Did you Know?

Did you Know?

Benjamin Franklin invented bifocals.  The first corrective lens was used by Nero in the 1st century.  The first Spectacles,(eye glasses), were made by Salvino D’Armate in Italy in 1284.

 

In this later life, Benjamin Franklin developed presbyopia. As he was also myopic, he got tired of constantly having to interchange two paris of glasses. So he decided to figure out a way to make his glasses let him see both near and far. He had two pairs of spectacles cut in half and put half of each lens in a single frame to make a bifocal.

 

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Did you Know?

Leonardo Da Vinci (15 April 1452 – 2 May 1519) was an Italian Renaissance genius. He was good at many things, but was most famous as a painter. He was also a scientist, a mathematician, an engineer, an inventor, an anatomist, a sculptor, an architect, a botanist, a musician and writer. Leonardo was curious about everything in nature. He wanted to know how everything worked. He was very good at studying, designing and making all sorts of interesting things.

Leonardo Da Vinci is frequently credited with introducing the idea of contact lenses in his 1508 Codex of the eye, Manual D, where he described a method of directly altering corneal power by submerging the eye in a bowl of water. Leonardo, however, did not suggest his idea be used for correcting vision—he was more interested in learning about the mechanisms of accommodation of the eye

Did you Know?
 

Leonardo da Vinci could write with the one hand and draw with the other simultaneously.

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Did you Know?

Did you know?

Our Eyes are the most complex organs you possess except for your brain.

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