Abstract: A stereoscopic eye measurement system and method for measurement of corneal characteristics, anterior chamber depth and lens characteristics in a single acquisition. The system and method use a stereoscopic camera configuration to capture the images of IR pupil, of the intersection of a structured illumination pattern with the cornea and lens, and of the Placido reflection off the cornea. The projection pattern may be a cross pattern, a dot array, a dot+cross pattern, or a starburst pattern. The system uses a large pupil in order to obtain images of the lens. The system uses different focal points to achieve the best images of corneal topography, corneal layering and lens surfaces and a combination of corneal topography, corneal layering, pupil and the lens.

Abstract: A bar code reader of the type which directs a light beam to scan an area (i.e. raster scan) is disclosed herein. The reader includes first and second oscillating mirrors for directing a light beam from a photodiode to a bar code, and for directing portions of the light beam reflected from the bar code back to a photodetector which generates an electrical signal representative of the information embodied in the bar code. The first oscillating mirror scans the light parallel to a first line (e.g. vertical line) at a first frequency onto the second oscillating mirror. The second oscillating mirror scans the light from the first mirror parallel to a second line (e.g. horizontal line perpendicular to the vertical line) at a second frequency greater than the first frequency onto the bar code. The first mirror may be a compound mirror having a concave, reflective surface which circumscribes a flat, reflective surface.

Abstract: A laser scanner wherein an elliptical laser light beam is directed to the target (a bar code symbol) so as to increase the signal to noise ratio of the laser light received by the photodetector. The use of laser light in the shape of an ellipse, instead of the prior spherical shaped laser light, where the long axis of the elliptical laser light is aligned with the bars of the code being read reduces the distortion of the optical signals received by the photodetector. Thus the signal to noise ratio is maximized so as to enable the resolution of fine, dense bar codes.