cataract

A cataract is an opacity that develops in the lens of the eye, 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.
Cataracts develop from a variety of reasons, including long-term ultraviolet exposure,exposure to radiation, secondary effects of diseases such as diabetes, or simply due to advanced age; they are usually a result of Denaturation of lens. genetic factors are often a cause of congenital cataracts and positive family history may also play a role in predisposing someone to cataracts at an earlier age, a phenomenon of "anticipation" in pre-senile cataracts. Cataracts may also be produced by eye injury.

Common symptoms are

• Blurry vision
• Colors that seem faded
• Glare
• Not being able to see well at night
• Double vision
• Frequent prescription changes in your eye wear

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.

TREATMENT OF CATARACT

When symptoms begin to early, you may be able to improve your vision while using new glasses, strong bifocals, appropriate lighting or other visual aids as long as not disturbing your daily activity. In mature cataract it may consider to do surgery. And most history cataract surgery are succesfull to restore vision.