Cataracts are primarily divided into two main groups based on their causes and onset time: Congenital Cataract and Age-related (Senile) Cataract.

Congenital Cataract: Characterized by the unilateral or bilateral loss of transparency and opacification of the lens, observed from birth. This type of cataract can arise as a result of infections the mother experienced during pregnancy or certain medications she used, or sometimes it can develop without any known cause.

Age-related (Senile) Cataract: Typically manifests as a gradual decrease in vision in individuals aged 50-60 and above. The risk of cataract development is 60% higher in diabetic patients. In individuals within this risk group, it is possible for cataracts to progress rapidly and become a serious vision problem even in their 30s or 40s.