Cataracts are a cloudy or opaque area in the lens of the eye. Cataracts develop slowly with a gradual onset of difficulty with vision. Visual problems may include difficulty seeing at night, halos around lights, glare sensitivity, and decreased visual acuity, even in daylight.

Cataracts are accelerated by environmental factors, such as smoking or other toxic substances and they may develop at any time throughout life following an eye injury. Cataracts may also develop in response to metabolic diseases such as diabetes.

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