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The Eye Practice
The Eye Practice
Optical coherence tomography.

Keratoconus types

There are four main types of keratoconus including round cone, oval cone, forme fruste and keratoglobus.

About the types of keratoconus

The shape of the cornea as well as where the cornea has become thinner determine the type of keratoconus.

There are four main types, in addition to rarer variations of the disease.

The type of keratoconus must be professionally diagnosed. This is usually done with the help of a special imaging device to map  the surface of the eye.

The various types of keratoconus

Round or nipple cone keratoconus affects a relatively small area of the cornea, however the steepness of the affected area can be extreme. This keratoconus type results in marked visual deterioration.

Oval or sagging cone keratoconus affects a larger portion of the cornea. It can cause rupturing (or hydrops) of the cornea’s internal membranes and scarring, as well as making it harder to fit contact lenses.

Forme fruste is the most common type of keratoconus. It is also the most mild. In fact, forme fruste keratoconus is usually symptom-free and only diagnosed by mapping the surface of the eye.

In forme fruste keratoconus the disease starts, but for some reason it stopped progressing. Most people with forme fruste keratoconus do not need treatment.

This is a rare type of keratoconus where the entire cornea thins and bulges forward. The best visual correction usually involves wearing large diameter scleral lenses.

Posterior keratoconus is a very rare condition where the inside surface of the cornea is abnormally thin, while the outside remains normal in curvature. It can be across the whole inner surface or in just one part. It tends to have less impact on vision because the outer surface of the cornea is unaffected.

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Mapping the cornea

Yellow and red regions show where the shape of the cornea is steeper.

Diagnosing keratoconus types

Optometrists diagnose the various types of keratoconus with specialised equipment. Some of these map the topography of the eye, while others measure the thickness of the cornea.

Corneal topography can be understood in the same way as the topography of hills and valleys. Cool colours (blues) represent flatter areas while hotter colours (orange and reds) indicate steepening. An optometrist can read corneal topography to help diagnose the type of keratoconus.

In addition, optometrists measure the thickness of the cornea using a global pachymeter. This instrument also aids in correctly diagnosing the type.

Managing keratoconus types

Each type of keratoconus requires expert management. Dr. Jim Kokkinakis is one of Australia’s foremost experts in the treatment and management of keratoconus.

Indeed, he is a keratoconus specialist and a Senior Lecturer at the Optometry School UNSW.

So if you suffer keratoconus Dr. Kokkinakis can help. He can explain how to manage the disease as well as advising on the best treatment options.

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Learn more about keratoconus

  • Patient stories of living with keratoconus.

Living with keratoconus

Our patients share their stories of living with keratoconus. See how, with careful treatment, you can thrive in spite of keratoconus.

  • Keratoconus

Keratoconus

Keratoconus is a condition that causes blurred vision and shortsightedness.

  • Optical coherence tomography.

Keratoconus types

There are four main types of keratoconus including round cone, oval cone, forme fruste and keratoglobus.

  • Keratoconus symptoms.

Keratoconus symptoms

Keratoconus symptoms include itchy eyes, blurry vision, sensitivity to bright light and halos around lights at night.

  • Keratoconus treatment.

Keratoconus treatment

Keratoconus treatment uses devices to improve vision. These include glasses and contact lenses, but surgical options may also be required.

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