ABSTRACT
The cornea accounts for approximately two-thirds of the eye’s total optical power, making it the most important refractive element in the human eye. The emphasis on quantitative assessment of the cornea dates back to the 1600s [1], and its importance cannot be overemphasized in this current era of rapid advances in refractive surgery with an unprecedented demand to achieve optically perfect results. Cornea surface analysis has become indispensable for the current-day practice, where other important applications include diagnosis of forme-fruste keratoconus, monitoring of ectatic noninammatory diseases, and complicated contact lens tting in advance keratoconus. Technologies in corneal mapping have evolved from Placido-based (reective technique) computerized videokeratography systems to slit-scanning (projective technique) topography methods to a hybrid of both technologies, revolutionizing the capabilities and precision of measuring corneal surfaces.
