Cataracts are caused to due change in lens microstructure due to age.As you grow older there is coagulation of protein crystallin or vacuole formation on the lens which makes it opaque. Also sometimes lens color changes to yellowish brown. This leads to blurred vision.
Non- age related cataracts are caused due to various factors.
It leads to development of secondary cataract. Person with diabetes are at higher risk of cataract.
Certain drugs are associated with cataract development.Corticosteroids, Chlorpromazine and other phenothiazine related medications.
This increases the chance of cataract 2-3 folds higher, if compared with non-smoker.
Damage to lens may be caused due to some internal injury. This can lead to formation of clumps in eyes and decrease the vision.
Harmful UVB rays coming from sun may lead to cataract formation. Excessive heat may affect the heat sensitive enzymes which protect lens proteins.
Low level of anti-oxidants in body due to improper diet may lead to cataract. Including vitamin C and E in your diet will reduce the risk.
Cataract from childhood is due to chromosomal abnormalities. It is inherited.