Types of Cataracts

What is Cataracts?

A cataract is a clouding that develops around the lens. It slowly causes vision loss and can leave you blinded if not treated. The condition impacts both eyes but in most cases always one eye is always affected sooner than the other. It is the most common cause of vision loss for people over 40 years of age.

Types of Cataracts:

  • A Sub capsular Cataract

  • This occurs at the back of the lens. People with diabetes, high farsightedness or those who take a high dosage of steroids have a higher risk of developing a sub capsular cataract.
  • A Nuclear Cataract

  • This forms in the central zone of the lens. Nuclear cataract usually happens because of aging.
  • A Cortical Cataract

  • This type of cataract occurs in the lens cortex, which surrounds the central zone of the lens.

Cataract Symptoms and Signs

Cataracts usually form slowly and cause only a few symptoms until they are noticeably block light. These symptoms include:

  • Vision that is cloudy/blurry/foggy.
  • Changes the way you see colour because the colourless lens acts as a filter.
  • Problems driving at night such as glare from bright lights and ongoing headlights.
  • Problems with glare during the day.
  • Double vision.
  • Sudden changes in glasses prescription.
  • "Second Sight" - When a person who regularly wears reading glasses can suddenly read without them.

Who's most at risk?

  • People that are 50 years and over.
  • Genetic diseases such as Down syndrome.
  • Certain medications, such as steroids.
  • Having an infection, such as rubella, taking drugs, or having radiation therapy during pregnancy.
  • Metabolic disorders, such as diabetes.
  • Smoking.
  • Excessive exposure to UV radiation.


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