1. An apparatus for imaging an ocular tear film, comprising: a control system configured to: (a) receive at least one first image containing optical wave interference of specularly reflected light in a first polarization plane along with a background signal from a region of interest (ROI) of an ocular tear film captured by an imaging device while illuminated by a multi-wavelength light source; (b) receive at least one second image containing the background signal in a second polarization plane perpendicular or substantially perpendicular to the first polarization plane from the ROI of the ocular tear film captured by an imaging device; (c) subtract the at least one second image from the at least one first image to generate at least one resulting image containing the optical wave interference of specularly reflected light from the ROI of the ocular tear film with the background signal removed or reduced.