Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-03-11
1998-03-31
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351237, A61B 306
Patent
active
057344590
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.
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Mai Huy
National Science Council
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