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Eye Health Information

Keratoconus

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Keratoconus

Introduction

Keratoconus is a condition where the cornea becomes thin and stretched near its center, causing it to bulge forward into a conical shape. As a result vision becomes distorted.

Keratoconus does not cause total blindness, however, without treatment it can lead to significant vision impairment. With current treatments now available most patients with keratoconus are able to lead normal lifestyles.

Keratoconus is a progressive eye disease, usually affecting both eyes. The degree of progression in each eye is often unequal, and it isn’t unusual for the condition to be significantly more advanced in one eye.

The cornea is the clear surface at the front of the eyeball. It refracts the light entering the eye onto the lens, which then focuses it onto the retina.

Causes

The cause of keratoconus is unknown. However, it is believed to be an inherited condition. Some studies have connected keratoconus with allergies such as asthma and eczema. It has also been found that poorly fitted contact lenses and excessive rubbing of the eye may contribute to the cause.

Symptoms

The initial symptom of keratoconus is an irregular shaped cornea, where it appears to ‘bulge’ forward from the eye socket. This may not be that obvious at first, though will develop over time.

Vision is usually affected once the cornea starts to change shape. Blurring, light sensitivity and seeing ghost-like images can occur.

Diagnosis

Most people with keratoconus begin to develop the condition in their late teens or early 20’s, with the majority of transplants being performed on patients between 20 – 45 years of age.

In Australia keratoconus is estimated to occur in 1 out of every 2000 people, with no significant prevalence in either males or females.

Treatment

There are various options for the treatment of keratoconus, including; spectacles/glasses, contact lenses, corneal implants and corneal transplants.

Glasses – In the early stages of keratoconus, glasses are usually successful in correcting the myopia and astigmatism, however as the condition advances the cornea becomes highly irregular and vision is no longer adequately corrected with glasses.

Contact lenses – Contact lenses are used to maintain the regular shape of the cornea, however in 5 – 10% of patients there comes a stage when contact lenses are no longer effective and a corneal transplant is considered.

Contact lenses do not slow down the rate of progression of the conical cornea, however they do give good vision during that period which could not of otherwise be achieved.

Surgery – Corneal transplants have a very high success rate following transplantation, with 98.1% of transplanted corneas surviving the first year, and 97.5% surviving beyond four years. To find out more on corneal transplant procedures, click here.

A thorough examination with your ophthalmologist will help establish which treatment is best for your individual case.

The Lions Eye Institute also conducts an array of Clinical Trials. You can view these on our Clinical Trials page.

Further information and support

For further information on keratoconus, including treatment, recovery, and risks and complications, please consult with one of our ophthalmologists.

What’s Next?

Please contact The Lions Eye Institute to make an appointment with the appropriate ophthalmologist.  A current referral from either a GP, or an optometrist, is required for all appointments.

Australian and international references

www.keratoconus.asn.au
www.eyeinstitute.co.nz/the-eye/eye-diseases-and-conditions/keratoconus.htm
www.moorfields-private.co.uk

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