Corneal Topography is a non-invasive imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. Since the cornea is normally responsible for some 70% of the eye’s refractive power, its topography is of critical importance in determining the quality of vision. The pattern of the device’s internal concentric rings are focused on the anterior surface of the patient’s cornea and reflected back to a digital camera. The topology of the cornea is revealed by the shape taken by the reflected pattern. The procedure is painless and very fast. The computer then uses image to produce a printout of the corneal shape using colors to identify different elevations, much like a topographic map of the earth describes changes in the land surface.
Conditions such as keratoconus and pellucid marginal degeneration may exhibit corneal steepening before any biomicroscopic signs are evident. The device is most often necessary when evaluating pre- and postsurgical patients for refractive surgery. It is a must for corneal Corneal Refractive Therapy (or orthokeratology), a non-surgical treatment that corrects your vision while you sleep. The Corneal topographer significantly increases the success rate of contact lens fitting and improves the overall management of your more difficult patients.