Topography

If you are looking for a laser eye clinic in London, then the London Vision Clinic should be on your shortlist.  

That may seem like a strong statement, but the London Vision Clinic emphasises that, in expert hands, laser eye surgery can be an extremely safe, life enhancing experience. More than 100,000 laser eye surgery procedures will be done in the UK this year. Read the guide to Laser Eye Surgery to help make the right choice for your eyesight.

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What is it for?

Measuring the shape of your corneal surfaces.

When is this done?

Initial screening and during post-operative appointments.

What actually happens?

You will rest your chin on a padded support and stare straight into the examining instrument. The clinician sits in front of you and shines a bright light into your eye to help align the instrument properly. They will ask you to open your eyes widely, to take a number of multi-coloured pictures that are printed and added to your pre-operative report. The different colours on these pictures, like a topographic map, will show the different elevations of your corneal surface(s) and the thickness profile of your cornea.

How does it feel?

You feel nothing as the instrument doesn’t make contact with your eye.

What does it do?

The topographer captures an image of your eye to create a topographic map of the front, and in some units also the back, surface of the cornea.

How does it benefit you?

Topography is one of the most important safety factors in determining how suitable you are for laser eye surgery. The most basic kind of topography measures the shape of the surface at the front of your eye. The most detailed topography measures the shape of both the front and back surfaces and the thickness profile of your cornea. In very irregular corneas topography guided treatments are performed to provide a more regular corneal shape.