Keratoconus

What

Keratoconus is a vision disorder that occurs when the normally spherical cornea (the front part of the eye) becomes thin and irregular (cone) shaped. This abnormal shape prevents the light entering the eye from being focused correctly on the retina and causes distortion of vision.

Symptoms

In its earliest stages, keratoconus causes slight blurring and distortion of vision and increased sensitivity to glare and light. These symptoms usually appear in the late teens or late twenties. Keratoconus may progress for 10-20 years and then slow in its progression. Each eye may be affected differently.

As keratoconus progresses, the cornea bulges more and vision may become more distorted. In a small number of cases, the cornea will swell and cause a sudden and significant decrease in vision. The swelling occurs when the strain of the cornea’s protruding cone-like shape causes a tiny crack to develop. The swelling may last for weeks or months as the crack heals and is gradually replaced by scar tissue.

Treatment

If this sudden swelling does occur, your optometrist can prescribe eyedrops for temporary relief, but there are no medicines that can prevent the disorder from progressing.

Glasses or soft contact lenses may be used to correct the mild short-sightedness and astigmatism that is caused by the early stages for keratoconus.

As the disorder progresses and cornea continues to thin and change shape, rigid gas permeable contact lenses can be prescribed to correct vision adequately. In most cases, this is adequate. The contact lenses must be carefully fitted by a specialist such as one of our optometrists, and frequent check-ups and lens changes may be needed to achieve and maintain good vision.

In a few cases, a corneal transplant is necessary. However, even after a corneal transplant, glasses or contact lenses are often still needed to correct vision

If you need any further advice about this condition, please contact Ian Cameron.

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