The only way to find a cataract is with an eye exam. A doctor who treats eyes will look at your lens. Other tests look at the structure and health of the eye. A full eye exam will have:

  • A visual acuity test—This eye chart test measures how well you see at distances. Your eyesight may also be tested under low contrast or glare.
  • Dilated eye exam—The doctor gives you special eye drops to widen your pupil. This lets the doctor see the lens and the structures of the back of the eye.
  • Slit lamp exam—This is an exam of the eye using a microscope that magnifies the eye.
  • Tonometry—This is a test to measure fluid pressure inside the eye (too much pressure may be a sign of glaucoma).

Revision Information

  • Reviewer: EBSCO Medical Review BoardJames P. Cornell, MD
  • Review Date: 12/2018 -
  • Update Date: 02/08/2019 -