Where a variety of reasons, such as aging, genetic, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., metabolic disorders, can cause the lens protein denaturation and lead to the lens opacity, known as cataracts, the light is cloudy lens block cannot be projected on the retina, causing blurred vision. It is more common over the age of 40, and its incidence increases with age.
This disease can be divided into congenital and acquired nature:
Also called developmental cataracts, much in the existing before and after birth, much as the static type, can be associated with genetic diseases, there are endogenous and exogenous and endogenous rendering is associated with fetal development obstacle, exogenous is maternal or fetal body lesions caused by damage to the lens, congenital cataract is divided into before cataract, cataract, around the nuclear cataract and cataract.
After birth due to systemic disease or eye disease, local nutrition metabolic abnormalities, poisoning, degeneration and trauma caused by reason of the lens opacity, divided into 6 types: (1) of senile cataract, the most common, also called age-related cataract, see more at 40 years of age or older, and along with the age growth and increasing, related to many factors, such as the elderly slow metabolism in degenerative diseases, also some people think that with the sun shine for a long time, the endocrine disorder, metabolic disorders and other factors, according to the location of the incipient opacity can be divided into two categories, nucleus and cortical. (2) Complicated cataract (complicated with other eye diseases). Traumatic cataract. Metabolic cataract. (5) Radioactive cataract. Drugs and toxic cataract.