Cataracts can be classified into several types based on their location and cause. The most common type is nuclear cataract, which forms in the center (nucleus) of the lens and is often associated with aging. This type usually leads to a gradual yellowing and hardening of the lens, affecting distance vision. Another type is cortical cataract, which develops in the lens cortex, the outer edge of the lens. It typically starts as white, wedge-like opacities or streaks that progress towards the center, causing problems with glare and contrast sensitivity. Posterior subcapsular cataract occurs at the back of the lens, just beneath the capsule. This type often progresses more quickly than other types and can interfere with reading and cause glare or halos around lights. Less common types include congenital cataracts, which are present at birth or develop in early childhood, and secondary cataracts, which can develop as a result of other medical conditions, such as diabetes, or from long-term use of certain medications like corticosteroids. Traumatic cataracts can occur after an injury to the eye. Each type of cataract has distinct characteristics and may affect vision differently, but all can be treated effectively with surgery.