We expected the CCT variation occurring with air puff indentation. It may reflect the biomechanical properties of cornea, since an elastomer is deformed under pressure. According to our measurement, the of the original CCT was . It decreased by 7.6% at highest concavity before correction, and the result was approximately consistent with the observation in our previous study.20 After correction, the CCT increased by 2.5%. However, it is too rough to confirm that the CCT really increased by 2.5%, i.e., that a -thick cornea thickens by . We have reservations about this thickening phenomenon, considering the resolution of the Corvis ST is for human corneas. Moreover, the reason behind the phenomenon from the aspect of biomechanics is unclear. In this study, we corrected the Scheimpflug distortion for measuring dynamic CCTs, but there are still many technical obstacles to be overcome for finding the reason behind the phenomenon. If the thickening is true, we hypothesize the viscoelasticity33 may cause the phenomenon. As most biological materials, the cornea exhibits viscoelasticity.34 On the grounds of its elastic nature, it responds instantaneously to a stress. Meanwhile, to accommodate its viscous behavior, the strain decays with time. The corneal tissue may be accumulated within the central part under a prompt air puff indentation. Further studies should be conducted to have a better understanding about the dynamic indentation process of cornea using biomechanical analysis. In addition to the thickening phenomenon, a weak correlation was observed between the uncorrected variation and the original CCT in our clinical cases. It was consistent with the simulation result in Fig. 3(d), which shows an increasing tendency of thickness variation with the CCT without correction. It was remarkable that the proposed method eliminated the association by correcting the Scheimpflug distortion.