Animation Movie AvailableRelated Media: Cataract Surgery


A cataract is a clouding of the eye's lens. It leads to decreased vision. The lens of the eye focuses an image onto the retina at the back of the eye. This is where an image is processed, and then sent to the brain.As the cataract matures, it often causes glare, and decreased vision, contrast, and color sensitivity.
Copyright © Nucleus Medical Media, Inc.


The lens of the eye is made of mostly water and protein. The protein is arranged in a way that keeps the lens clear so light can pass through it. A cataract forms when some of the protein clumps together and starts to cloud an area of the lens. A cataract won't spread from one eye to the other, although most people develop cataracts in both eyes at similar times.There are several causes of cataracts, including:
  • Aging, the most common cause
  • Smoking
  • Diabetes
  • Certain infections
  • Exposure to radiation, certain toxins, or medications
  • Taking adrenal cortical hormones for a long time
  • Birth defect, inborn error of metabolism, or chromosomal abnormality

Risk Factors

Factors that may increase your chance of a cataract include:

leave comments
Did you like this? Share with your family and friends.
Related Topics:
Current Research From Top Journals

Music May Improve Sleep Quality in Adults with Insomnia
October 2015

Insomnia can make your days miserable and a cure can be hard to find. There are some medications but there is some worry with side effects and the potential for addiction. Music is side effect free and according to this study may help you find sleep.

dot separator
previous editions

CPAP May Help Older Adults with Obstructive Sleep Apnea
September 2015

Water Before Meals May Promote Weight Loss
August 2015

Fecal Transplants Induce Ulcerative Colitis Remission
July 2015

dashed separator


Our Free Newsletter
click here to see all of our uplifting newsletters »