Keratoconus - Diagnosis

Please discuss the events and symptoms that led to a diagnosis of keratoconus.

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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.

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