Fig. 2From: An imaging system integrating optical coherence tomography and interferometry for in vivo measurement of the thickness and dynamics of the tear filma The axial PSF measured from a mirror at path difference of 200 µm. The FWHM of the axial PSF at this position is 1.9 µm in air, corresponding to 1.38 µm in corneal tissue. b Sensitivity fall-off of the system evaluated by measuring the axial PSF at different depthsBack to article page