Keratoconus - Diagnosis

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How Is Keratoconus Diagnosed?

The doctor may notice some things during the examination, or the patient may mention symptoms, that could be caused by keratoconus. These include:

  • Sudden change of vision in just one eye.
  • Double vision when looking with just one eye.
  • Objects both near and far look distorted, but not blurred. In other words, small details of the objects are clear, but the shapes or colors look wrong. Later, distant objects do become blurred.
  • Bright lights look like they have halos around them.

These things might be related to keratoconus, but your doctor must measure the curvature of the cornea to be certain. Several different instruments can be used to measure the curvature of the cornea.

One instrument, called a keratometer, shines a pattern of light onto the cornea. The shape of the reflection of the pattern tells the doctor how the eye is curved. There are also computerized instruments that make three-dimensional "maps" of the cornea, a process called corneal topography.

Return to Keratoconus

See what others are saying

Comment from: Marge, 55-64 Female (Patient) Published: August 29

I was diagnosed with keratoconus in my early 20s. During the 70s and 80s medical information was not available. I'm in my 60s now. With the help of a good eye doctor I was able to hold a job and lived a full life.

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Comment from: Shixson, 25-34 Female (Patient) Published: February 05

I was first diagnosed with keratoconus only after I went in for LASIK corrective surgery. I was sedated and the doctor was ready to start the procedure when he stopped at the last minute because he noticed something on the mapping of my cornea. He then referred me to an ophthalmologist in the area that studies keratoconus. He diagnosed me and stated having LASIK surgery performed would greatly affect my corneas and I would need corneal transplants if performed. I now wear RGP (rigid gas permeable) contacts and my vision is better than it ever was!

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