Nuclear sclerosis is the most common type of cataract, and involves the central or 'nuclear' part of the lens.This eventually becomes hard, or 'sclerotic', due to condensation on the lens nucleus and the deposition of brown pigment within the lens.This damage allows fluid from other parts of the eye to rapidly enter the lens leading to swelling and then whitening, obstructing light from reaching the retina at the back of the eye.
most commonly through mechanisms that protect and maintain the lens.
The presence of cataracts in childhood or early life can occasionally be due to a particular syndrome.
The addition of damage to the DNA of the lens cells has been considered.
This same process makes the clear albumen of an egg become white and opaque during cooking.
Signs and symptoms vary depending on the type of cataract, though considerable overlap occurs.
People with nuclear sclerotic or brunescent cataracts often notice a reduction of vision.
Those with posterior subcapsular cataracts usually complain of glare as their major symptom.
The severity of cataract formation, assuming no other eye disease is present, is judged primarily by a visual acuity test.
Cataracts may be partial or complete, stationary or progressive, or hard or soft.
The main types of age-related cataracts are nuclear sclerosis, cortical, and posterior subcapsular.
Cortical cataracts are due to the lens cortex (outer layer) becoming opaque.