Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-05-15
1999-03-16
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
058836918
ABSTRACT:
Light sources illuminate eyes in a predetermined cycle using the pulse of light. Video cameras are directed to the eyes, and a video signal of the pupil is output. This video signal is output to a digital computer via video control units, a multiplexer, and an analog-to-digital converter. The digital computer detects the size of the pupil by processing an input video signal.
REFERENCES:
patent: 4850691 (1989-07-01), Gardner et al.
patent: 5617872 (1997-04-01), Scinto et al.
Medical & Biological Engineering & Computing, vol. 30; No. 5; Sep. 1992; Stevenage, GB; pp. 487-490, XP000323414, D.P. Jones et al.: "Pupillometer for Clinical Applications Using Dual 256-Element Linear CCD Arrays".
Science, vol. 266; no. 5187; Nov. 11, 1994, US; pp. 1051-1054, XP000576055, L.F.M. Scinto et al "A Potential Noninvasive Neurobiologival Test for Alzheimer's Disease".
Hosaka Hidehiro
Ishikawa Norio
Sonoda Shigeaki
Dang Hung Xuan
Nihon Kohden Corporation
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