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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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Cataracts
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What Are Cataracts?
A cataract is a clouding of the lens in the eye. The normally clear lens lets light enter the eye. As it becomes cloudy, less light enters and vision becomes blurry. Cataracts are common with age and can occur in one or both eyes. The clouding of the lens usually happens slowly over time. But it can happen quickly.

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What Causes Cataracts?
Cataracts may be caused by many things, including the following:
  • Aging
  • Diabetes or other eye diseases
  • Past eye infections, injuries, or surgery
  • Some medicines (such as steroids)
  • Too much ultraviolet (UV) light, especially from sunlight
  • Cataracts can also run in families
 What Are the Symptoms?
Cataracts are not painful. But you may notice these symptoms:
  • Blurry vision
  • Details are hard to see
  • Glare when driving or reading
  • More light is needed to read
  • Some colors seem dull
  • Your prescription for glasses keeps changing
  • Double vision in one eye

 
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This information is not intended as a substitute for professional eye care.
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