Can cataracts cause blindness?

Cataract would not cause blindness. The cataract is the lens opacity in our eyes. The reasons are congenital, trauma, diabetic or caused by some eye diseases such as high myopia, uveitis and so on. The cataract would cause color problems. In the early onset of cataract, the people would see more blur than before and the object are more yellowish. When the cataract is extracted, the patient view more blueish than pre-operation. That is because of the opacity lens is yellow. So many companies introduce many IOLs that could block blue-band light wave to protect macula from impairment, such as SN60AT.