Cataract is the clouding of the eye's natural lens. It is the most common cause of vision loss in people over age 40 and is also the principal cause of blindness in the world.
Types of Cataract
Nuclear Cataracts (Cataracts affects the center of the lens) - A nuclear cataract may at first cause more nearsightedness or even a temporary improvement in your reading vision. But with time, the lens gradually turns more densely yellow and further clouds your vision.
As the cataract slowly progresses, the lens may even turn brown. Advanced yellowing or browning of the lens can lead to difficulty distinguishing between shades of color.
Cortical Cataracts (Cataracts that affect the edges of the lens) - A cortical cataract begins as whitish, wedge-shaped opacities or streaks on the outer edge of the lens cortex. As it slowly progresses, the streaks extend to the center and interfere with light passing through the center of the lens.
Posterior Subcapsular cataracts (Cataracts that affect the back of the lens) - A posterior subcapsular cataract starts as a small, opaque area that usually forms near the back of the lens, right in the path of light. A posterior subcapsular cataract often interferes with your reading vision, reduces your vision in bright light, and causes glare or halos around lights at night. These types of cataracts tend to progress faster than other types do.
Congenital Cataracts (Cataracts you're born with) - Some people are born with cataracts or develop them during childhood. These cataracts may be genetic, or associated with an intrauterine infection or trauma
Clouded, blurred or dim vision
Increasing difficulty with vision at night
Sensitivity to light and glare
Need for brighter light for reading and other activities
Seeing "halos" around lights
Frequent changes in eyeglass or contact lens prescription
Fading or yellowing of colors
Double vision in a single eye
Cataract removal – Consists of removing the cataract
Intraocularlens (IOL) implantation – Consists of placing the IOL inside the bag