Common Eye Disorders

CATARACT

What is Cataract ?

Normally, the lens of the eye is clear and allows light rays to pass through easily. When a cataract develops, the lens becomes cloudy and opaque. The light rays no longer pass through the lens easily, so the patient cannot see clearly.

Cataract is not a new growth or a film over the eye. In most cases, it is just part of the aging process.

It is not contagious

Types of Cataract

There are many types of cataracts.

A change in the chemical composition of the lens causes most cataracts. The following are the various types of cataracts.

Senile Cataract

This is the most common type of cataract, amounting to 80 percent of the total cataracts. It occurs in people above the age of 50.

Cataract
IOL (Intra Ocular Lens)
Glaucoma
Diabetic Retinopathy
Squint
Amblyopia
Uvetis
Orbital Disorders
Thyroid Eye Diseases
Computer Vision Syndrome (CVS)

Congenital Cataract

Cataracts in children are rare. They can be caused by infection of the mother during pregnancy, or they may be hereditary.

Traumatic Cataract

Eye injuries may cause cataracts in patients of any age.

Secondary Cataract

Eye diseases, like glaucoma, irises, eye tumours, and diabetes may cause cataracts.

Drug-induced Cataract

prolonged treatment with steroid drugs, either for local (e.g., allergic conjunctivitis) or systemic diseases (e.g., asthma) may lead to cataract formation.

Symptoms of Cataract

Cataract formation is not associated with "signals" such as pain, redness or tearing.

The common symptoms are :

Blurring or dimness of vision & Normal Vision

Feeling of a film over the eyes & Normal Vision

Sensitivity to Light and Glare & Normal Vision

Change in colour of pupil & Normal Vision

Double vision & dulling of Colour Sense & Normal Vision

Treatment

Cataract cannot be cured by medicines or spectacles. Removal of the clouded lens through surgery is the only treatment.

Types of Cataract Removal:

Routine method (old method)

After administering a local anesthesia, a 10 mm incision is made in the eye. The cataract lens is removed and it may be replaced by an Aphakic glass. The incision is then closed with sutures. After the surgery, glasses with high power called ophakic spectacles are prescribed to the operated person.

Disadvantages:

These ophakic glasses are heavy, images seen are larger than they normally appear to be, and the field of vision is restricted.

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