weeks after treatment. An earlier assessment of its outcome could lead to an optimization of
the treatment, including an immediate re-intervention in case of failure, thereby, avoiding
additional discomfort and pain to the patient. In this study, we propose two-photon imaging
(TPI) as an earlier evaluation method. CXL was performed in human corneas by application
of riboflavin followed by UVA irradiation. Autofluorescence (AF) intensity and lifetime images …