A calibration method for central corneal thickness measurement from Scheimpflug imaging in a non-contact tonometer with pachymetry

摘要

We propose a method to calibrate the pachymetry for central corneal thickness (CCT) measurement from a Scheimpflug imaging of a non-contact tonometer. Our calibration method takes into account not only the Scheimpflug imaging geometric distortion but also the slit width variation of the Scheimpflug illumination path. Based our method, CCT measurement with accuracy better than +12 um is achieved.