Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Methods of use
Patent
1998-01-16
1999-10-26
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Methods of use
351242, A61B 300, A61B 302
Patent
active
059715430
ABSTRACT:
In this device, we employed four sets (or three sets) of different wavelength light sources and mixed each other to form the Moreland's color matching equation (a 580 nm+b 480 nm=c 440 nm+d 500 nm) or the Rayleigh's color matching equation (a 590 nm=b 546 nm+c 650 nm) and resulted in two mixed lights. On these two light paths, we employed a flat mirror to separate them into two halves and formed a single light path. On this light path, we added a neutral density filter to adjust light intensity to reach our purpose of attenuating the light intensity. In addition to this, a shutter diaphragm was set on the same light path to adjust a proper lighting area on the retina. Behind the shutter diaphragm, a set of lenses focused the light beam on to the observer's pupil of human. In order to monitor the observer's eye of human, a set of IR LED's was put and surrounded the transmission hole of the housing in front of the observer's eye, and the reflective IR light of the eye image was reflected by a dichroic mirror which was aligned 45 degrees with the impinging light beam and caused the eye image being caught by a CCD camera. Thus the eye image could be monitored by a B/W TV and the focused light position on the pupil could be adjusted.
REFERENCES:
patent: 4798458 (1989-01-01), Gehrung et al.
patent: 4966453 (1990-10-01), Chang
patent: 5734459 (1998-03-01), Chang
Mai Huy
National Science Council
LandOfFree
Method of measuring metabolic activity employing an anomaloscope does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of measuring metabolic activity employing an anomaloscope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of measuring metabolic activity employing an anomaloscope will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-755753