An imaging polariscope has been used to analyze the spatially resolved polarization properties of living human corneas. The apparatus is a modified double-pass setup, incorporating a liquid-crystal modulator in the analyzer pathway. Keeping the incident polarization state fixed (first passage), we recorded a series of three images of the pupil’s plane corresponding to independent polarization states of the analyzer unit. Azimuth and retardation at each point of the cornea were calculated from those images. Results show that the magnitude of retardation increases along the radius toward the periphery of the cornea. Left–right eye symmetry in retardation was also found. Maps of azimuth indicate that the direction of the corneal slow axis is nasally downward.
© 2002 Optical Society of America
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(330.5370) Vision, color, and visual optics : Physiological optics
Juan M. Bueno and Fernando Vargas-Martín, "Measurements of the corneal birefringence with a liquid-crystal imaging polariscope," Appl. Opt. 41, 116-124 (2002)