We now know that the clouding of the lens usually occurs as a result of natural aging processes, metabolic changes, injury, various forms of radiation, or toxic chemicals or drugs.
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We the clouding of the lens
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that the clouding of the lens usually occurs as a result of natural aging processes, metabolic changes, injury, various forms of radiation, or toxic chemicals or drugs T:now
as a result of natural aging processes, metabolic changes, injury, various forms of radiation, or toxic chemicals or drugs T:usually