Cataracts are cloudy areas that form in the natural lens inside the eye. This lens sits behind the pupil, hence is if often difficult to see a cataract without a microscope. 

In the early stages, there are often no symptoms. In moderate to severe stages, the cloudiness results in reduced vision in the same way that a dirty window scatters light. Patients may report more glare symptoms or difficulty with night vision or reading in low light. 

There may be a need to update prescription glasses due to eye power changes from developing cataracts. Improving lighting in the home may assist with daily tasks. When the lens cloudiness progresses to a stage where spectacle updates do not adequately improve vision, then surgical treatment may be required. This is often when driving vision or functional work vision may be at risk. 

There are different types and causes of cataracts. Age is the most common cause. Some babies are born with congenital cataracts. Cataracts may be caused by certain medications, for example steroid medications. Trauma and radiation to the eyes can also induce cataracts. 

For more detailed information: Cataract Symptoms, Causes, Risks & Treatments - Good Vision for Life

Preventing Cataract Development

For more detailed information on cataracts and photo assisted explanations > Cataract EyeWiki