Orbscan Corneal Topographer Bausch and Lomb Orbscan IIz Corneal Analysis System This optical mapping or corneal topography system mapping system is a diagnostic tool that shows the overall architecture of the cornea including surface power, thickness, front and back shape. Using an illuminated ring pattern and a beam of light that is shined across the cornea, the image sensors in the Orbscan IIz acquire over 9000 points of data in less than 2 seconds. That data is transformed into a wealth of information about the architecture of the cornea. The Orbscan IIz is unique among corneal topographers in its ability to image the posterior surface of the cornea. Early signs of certain corneal diseases or abnormalities are seen first on the posterior corneal surface. On this map, you can see: Top two images: Shape maps of the surface elevation of the front and back of the cornea. Lower left image: A map of the surface power of the cornea. Lower right image: A representation of the cornea's thickness. By identifying potential corneal problems pre-operatively, Dr. MacRae and the Flaum Eye Institute Refractive Surgery Center team can better counsel you on the safety of refractive surgery and which procedure would be the most appropriate for you.