Cataract ('safed motia') is a clouding or opacity of the normally transparent lens inside the eye. To understand why this leads to loss of vision, it is important to understand the functioning of a normal eye.

Inside the eye, behind the colored part of the eye (iris) with the black hole in the center (pupil) is a lens. In the normal eye the lens is clear or transparent. It helps to focus light rays on to the tissue at the back of the eye (retina). When cataract develops the lens becomes cloudy and prevents the light rays passing into the retina. The picture that the retina receives becomes dull and fuzzy. Cataract usually forms and progresses slowly and therefore leads to a gradual blurring of vision.

What causes cataract?

Most forms of cataract develop in adult life. The normal process of aging causes the lens to harden and become cloudy (opaque). This is called age-related cataract and it is the most common type. It can occur anytime after the age of 40. In younger people they can result from an injury, certain drugs, long-standing inflammation or illnesses such as diabetes. Babies can be born with this condition. This is called congenital cataract.

What are the symptoms of cataract? What is the treatment? Can it be cured by medicines?

There are no medications, eye drops, exercises or glasses that will cause cataracts to disappear once they have formed. Surgery is the only way to remove a cataract. Cataracts cannot be removed with a laser, only through a surgical incision. In cataract surgery, the cloudy lens is removed from the eye. In most cases, the focusing power of the natural lens is restored by replacing it with a permanent intraocular lens implant.

When should I have the surgery?

Usually, you can decide if, and at what stage to have the operation. The cataract may need no treatment at all if the vision is only a little blurry. A change in your eyeglass prescription may improve vision for a while. If visual impairment interferes with your ability to read, to work, or to do the things you enjoy then you will probably want to consider surgery. 

In the past, eye specialists often waited until the cataract became 'ripe' before suggesting you had it removed. Nowadays, with modern surgery the operation can be carried out at any stage of the cataract's development, and in fact, is a little safer to do before the cataract becomes 'ripe'.

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    Vinay Garodia

    Synergy Visitech Eye Centre

    South Extension II, Delhi - 110049, India

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