Some people are born blind or partially-sighted, but often, loss of sight is linked to other health problems. Here are some health conditions which may result in partial or complete loss of sight: Cataracts Cataracts are one of the most common causes of lost sight. They form over the lens and cause the vision to become very cloudy and blurred. Cataracts can often be treated very effectively with surgery, but in severe cases, it may not be possible to save the sight. Cataracts tend to develop slowly and at first, the changes may be very gradual and hard to spot; » » » [Read more]