Of all the technology currently available, corneal topography provides the most detailed information about the curvature of the cornea. Using a very sophisticated computer and software, thousands of measurements are taken and analyzed in just seconds. The computer generates a color map from the data. This information is useful to evaluate and correct astigmatism, monitor corneal disease, and detect irregularities in the corneal shape.
The map is interpreted much like other topography maps. The cool shades of blue and green represent flatter areas of the cornea, while the warmer shades of orange and red and represent steeper areas. This corneal map allows the physician to formulate a "3-D" perspective of the cornea's shape. Measuring astigmatism is important for planning refractive surgery, fitting contact lenses, and calculating intraocular lens power.