Figure 1.

Schematic of corneal OCT elastography and the measured tissue displacement profiles. (a) A corneal OCT elastography system was combined with a fixation target and a camera to monitor the measured area, an air-pulse stimulator to provide localized tissue excitation, and a common-path OCT instrument to detect the resulting mechanical wave and tissue deformation. SLD, superluminescent laser diode. (b) A typical in vivo corneal surface displacement profile measured in M-mode. The displacement amplitude was calculated from the surface baseline to the initial negative maximum primary deformation. The lateral distance between the stimulation point and the measurement point was 0.3 mm. The axial distance was varied in this experiment from 0.5 to 2.5 mm.