Corneal topography to check Keratoconus

Published: 05th March 2010
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When there are some disorders or diseases on our eyes, the cornea shape will change. So doctor uses corneal topography to map the cornea to check Keratoconus and other progressive eye diseases. And it is proved corneal topography is one of the best way to test the cornea and diagnosis of eye diseases. The following will give some introduction on how to use corneal topography to check Keratoconus.

For people with healthy cornea, the cornea in the corneal topography is smooth and flat, and there is a 90 degree axes perpendicular in the cornea. And if there is any irregularities, that means there are some problems with the cornea. For example, irregular astigmatisms can be diagnosed if there is steepening or irregular shaping of the axes. When doctors use corneal topography to check Keratoconus, they can make a judgment from "Inferior Steepening". For people who have corneal astigmatism, their shape of the cornea is like a football, while for normal ones, it should be round and smooth.

In addition, Keratoconus has some similarities with Pellucid Marginal Degeneration (PMD) from the corneal topography, which may cause people some confusion about them. Dr. Schalaeppi discovered PMD in 1957. Known as the peripheral form of Keratoconus, PMD means a lobster claw pattern by breaking down of the cornea. So we can see PMD and Keratoconus are in the same family and not easy to distinguish them. However, PMD still has its own specific feature. You can distinguish PMD from the steepening, which is from the outer margin of the cornea heading inwards, like pinching the center. And the signs of PMD are as following: Compared with Keratoconus, people can not feel pain with PMD. However, they can feel their visual distortions. In addition, there is no vascularization of the cornea and no scarring. And there is lobster claw formation with PMD.

Just as other eye diseases, the regular test at the eye doctor is critical for Keratoconus. Therefore, visit your eye doctor at a regular time and have a baseline corneal topography. The corneal topography can tell you if you are far away or bothered from Keratoconus. If you are unlucky to have this kind of eye disease, the test can help you to treat or stop the progression of Keratoconus in time, and finally to help you to have a good treating result. So please don't forget to visit your eye doctor and have your eyes checked at a regular time.

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