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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
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.