What causes cataracts?

Although scientists do not know for sure what causes cataracts, they suspect there could be several possible causes including:

  • smoking
  • diabetes
  • excessive exposure to sunlight
  • steroid use
  • diuretic use
  • certain major tranquilizers

For several of the potential causes listed (i.e., steroids, diuretics, and/or major tranquilizers), additional research is needed to differentiate the effect of the disease from the effect of the drugs themselves.

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