Is an eye condition in which the pressure in the eye rises and causes damage to the optic nerve. There are four types of glaucoma:

• Chronic- slow onset there is no pain but the eyesight becomes damaged over time.
  
  
• Acute- this is of sudden onset and can be painful, permanent damage will be done to your eyesight if not treated quickly.
  
  
• Secondary- this happens after you have suffered a different eye problem the result of the first has caused the second.
  
  
• Congenital – This is something which is present from birth and is where the eye has not developed properly.