A LINE IMAGING-SYSTEM FOR MEASUREMENT OF EYELID MOVEMENTS

A line scan imaging system which provides a facility for comprehensive measurement and analysis of eyelid motion in human subjects is descri bed. The device obtains parasagittal line images of the eye and eyelid s by focusing an image of the eye onto a linear 256-element CCD array. Line images are acquired and digitized at a rate of 200 per second an d stored in a buffer memory. The stored data are subsequently analysed on a PC to give measurements of eyelid displacement and velocity. Mea surements of eyelid displacement and velocity during normal blinks in five subjects were comparable with published results from other measur ement techniques.