Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1982-06-24
1986-10-21
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, A61B 310
Patent
active
046182306
ABSTRACT:
A visual stimulator for light stimulation of a subject's eyes to obtain electroretinogram, electro-oculogram or visually evoked potential responses. The stimulator comprises a light directing means for directing light from a light source into the subject's eyes, attenuator means for selectably attenuating the light source, photodetector means for producing an output signal representative of the radiant energy directed into the subject's eyes and signal processing means for receiving and processing the output signal to derive therefrom further output signals representative of the radiometric or photometric characteristics of said radiant energy. A light shutter comprising first and second shutter leaves affixed to the shafts of first and second galvanometers is also provided. The shutter leaves are positioned for pivotal movement with the galvanometer shafts to attenuate light passing between the shutter leaves. Attenuation control means is provided for selectably varying current signals applied to the galvanometers to selectably pivot the shutter leaves, thereby selectably varying the attenuation of light passing between the shutter leaves.
REFERENCES:
patent: 2166947 (1939-07-01), Fayerweather
patent: 3242344 (1966-03-01), Zuckerbraun
patent: 3303271 (1967-02-01), Hecker
patent: 3409905 (1968-11-01), Bemrose et al.
patent: 3514191 (1970-05-01), Hoskin
patent: 3518930 (1970-07-01), Thieme et al.
patent: 3561847 (1971-02-01), Kitsopoulos et al.
patent: 3632192 (1972-01-01), Grib
patent: 3639041 (1972-02-01), Cornsweet
patent: 3879113 (1975-04-01), Howland et al.
patent: 4033693 (1977-07-01), Payrhammer et al.
patent: 4060313 (1977-11-01), Kondo
patent: 4109237 (1978-08-01), Hill
patent: 4135791 (1979-01-01), Govignon
patent: 4208107 (1980-06-01), Oharek
patent: 4238142 (1980-12-01), Richards et al.
patent: 4251139 (1981-02-01), Matsumura
patent: 4257687 (1981-03-01), Kohayakawa
patent: 4265518 (1981-05-01), Matsumura
patent: 4266862 (1981-05-01), Trotscher et al.
patent: 4312574 (1982-01-01), Wilms
patent: 4370033 (1983-01-01), Kani et al.
Intensity of Stimulation and Rod and Cone Response in Clinical Electroretinography; Brunette et al; Canadian Journal of Ophthalmology 13:27, 1978.
ERG Responses of Rods and Cones During Dark Adaptation; Brunette et al; Canadian Journal of Ophthalmology 13:186, 1978.
VGH Develops Improved Testing Stimulator; Life Line Magazine, vol. 1, No. 3, Sep., 1979, pp. 14-15.
An Improved ERG Stimulator which Uses Microprocessor Control; Cavazzi et al; Digest of the Eighth Canadian Medical and Biological Engineering Conference; Aug., 1980.
An Improved ERG Stimulator; Ens, Text of Oral Presentation at the Eighth Canadian Medical and Biological Engineering Conference; Aug., 1980.
Evoked Response System; product brochure No. S832H78-Aug., 1978; Grass Medical Instruments; Quincy, Mass.
Visual Electrophysiology Test Instruments; product brochure of Life-Tech Instruments, Inc.; Houston, Tex.
Electroretinograph Electro-Oculograph Instrumentation; product brochure of LKC Systems, Inc.; Gaithersburg, Md.
Electrodiagnostic Instrumentation for Routine and Clinical Research Recordings; product brochure of LKC Systems, Inc.; Gaithersburg, Md.
Ophthalmic Electrophysiologic Testing Systems; product brochure of LKC Systems, Inc.; Gaithersburg, Md.
ERG EOG VEP Testing Made Practical; product brochure of Nicolet Biomedical Instruments; Madison, Wis.
Beattie Craig W.
Ens John
McEwen James A.
Bovernick Rodney B.
Vancouver General Hospital
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