Many people misunderstand about cataracts. Cataracts are not related to cancer; yet the cataracts are a clouding of the ordinarily clear and transparent lens of the eye. Normally, the lens of the eye is clear, but when a cataract forms, the lens can become so opaque and the light cannot easily be transmitted to the retina.
Cataracts are caused by a change in the chemical composition of the lens resulting in a loss of transparency. Cataracts are divided into 4 categories.
1. Senile cataracts
This is the most type of cataracts resulting form a process of aging at the early age of 40. All people will have cataracts when they are in the old age.
2. Congenital cataracts
Cataracts are sometimes hereditary or can be caused by infection or inflammation that affects the pregnant mother and the unborn baby.
3. Traumatic cataracts
This type of cataracts results from eye injuries, a hard blow, puncture, cut, intense heat or chemical burn.
4. Secondary cataracts
Certain drugs, systemic diseases or infection such as steroid and diabetes lead to this form of cataracts.

A person may or may not be aware that a cataract is developing. If the cataract is located on the outer edge of the lens, no change may be noticed in vision.
On the other hand, if the cloudiness is located near the center of the lens, it interferes with clear sight. The eyes may be more sensitive to light and glare, making night driving more difficult. The most common symptom of cataract is blurred vision.


Cataract microsurgery is commonly highly successful and more than 90% of patients are able to regain good vision. With the removal of the cloudy lens, artificial lens is needed to substitute its function of focusing light rays onto the retina. An intraocular implant is a popular treatment for cataract in this time by using artificial lens. Artificial lens, plastic discs e.g. monofocal intraocular lens, multifocal intraocular lens, and accommodative intraocular lens, are implanted inside the eyeball by surgery that have been used for many years with excellent results achieved.

The plastic artificial lens is usually called Intraocular lens (IOL). It is the most common prosthesis nowadays. Saint Peter Eye Hospital develops our new cataract surgery combined the new method of bimanual cool phacoemulsification to remove the cataract and the injection of the intraocular lens to restore the patient vision. This is the newest method of cataract surgery.

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