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A cataract is a condition of the eye that affects vision. Resulting from damage to the retina in an often age-related process known as macular degeneration, the cataract causes the lens in the eye to become clouded and blocks light from entering. This results in a blurred retina image, and thus poor vision.

Blurred/dim vision with no pain in bright light, but almost normal vision at night
Double vision caused by a clouding of the lens and refractive error (light rays enter the eye but are not focused at a single point on the retina)
Seeing halos around lights, such as when driving at night
The need to frequently change eyeglasses, better near vision without eyeglasses
White opacity in the center of the pupil

Cataract surgery involves removing the clouded lens and replacing it with a clear artificial lens. The following surgical techniques can be used to achieve this:

Phacoemulsification
Femtosecond laser

Although cataracts can occur in people of all ages, they are more common in older people. In most cases, cataracts are simply an effect of the aging process. However, there are certain risk factors which can cause cataracts to appear in younger people.

Long-term exposure to ultraviolet light
Eye diseases such as iris inflammation, eye infection
Underlying diseases such as diabetes, high blood pressure and thyroid disease
Eye injury or inflammation
Congenital defect caused by maternal infection with rubella
Long-term use of steroid medications

Get enough sleep
Choose a healthy diet
Give your eyes a break from time to time after long hours of focusing, such as from reading or using a computer
Wear sunglasses that block ultraviolet light, do not look directly at the sun
Avoid eye injuries and accidents
Have your eyes checked regularly. People over the age of 40 should have their eyes tested once a year.