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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.

Nuclear sclerosis is the most common type of cataract, and involves the central or 'nuclear' part of the lens.

The presence of cataracts in childhood or early life can occasionally be due to a particular syndrome.The appropriateness of surgery depends on a patient's particular functional and visual needs and other risk factors, all of which may vary widely.Lens proteins denature and degrade over time, and this process is accelerated by diseases such as diabetes mellitus and hypertension.In its advanced stages it is called a brunescent cataract.This type of cataract can present with a shift to nearsightedness, causing problems with distance vision though reading is less affected.Examples of chromosome abnormalities associated with cataracts include 1q21.1 deletion syndrome, cri-du-chat syndrome, Down syndrome, Patau's syndrome, trisomy 18 (Edward's syndrome), and Turner's syndrome, and in the case of neurofibromatosis type 2, juvenile cataract on one or both sides may be noted.