A cataract is a clouding of the natural lens of the eye. It is often age related and tends to worsen over time. Once it gets mature, it will make your vision blurry. Eventually, It may require a surgical procedure where an ophthalmologist will remove the cataract and insert a clear artificial implant in its place to restore your vision.
To learn more about cataracts, please visit the library of the doctors of optometry website at http://doctorsofoptometry.ca/cataracts/