LIGHT STIMULATOR

Abstract: A light stimulator device which tests and therapeutically stimulates the neurovisual system by visible light. It utilizes a balanced spectrum, magnetic, plasmatic light source (32) with different color filters (20) and different apertures (18) interposed between the light source and the subject's eyes. The flash rate of the light source (32) can be continuously varied (24) to provide for diagnostic CFF testing.

Description: LIGHT STIMULATOR DESCRIPTION TECHNICAL FIELD This invention relates to optical instrumentation, particularly to an instrument which tests and therapeutically stimulates the neurovisual system by visible light. BACKGROUND ART There have been many previous devices used to shine visible light into the eyes for therapeutic purposes. These devices have been used to treat amblyopia, photophobia, learning disabilities, dyslexia, headaches, hyperactivity, fatigue, and many other problems. These devices have consisted of a housing which contains a light source, color filters, and a viewing area. As a person looks into the viewing area, the light source emits light which passes through the color filters into the viewer's eyes. The object is to be able to produce specific wavebands of colored light which will act as a stimulus to the neurovisual system. Different waveband stimuli have been used for different patient conditions, as is known by those schooled in the art. Heretofore, users of these devices regarded them as unsatisfactory because of three major problems. The first problem was that of unsatisfactory therapeutic effectiveness due to untrue color stimuli created from the incandescent source used in all of the prior art devices. Incandescent lamps do not create a natural, balanced color spectrum. They produce a disproportionate high irradiance at the red end of the spectrum and a disproportionate low irradiance at the blue end of the spectrum. Since a color filter can only pass the color emitted by the light source, a disproportionate light emission produces disproportionate, untrue colors, and thus inferior, and sometimes totally ineffective, therapeutic color stimuli. For example, it is inherent in a yellow glass filter that it not only passes yellow, but it also passes orange and red. To get the effect of yellow as a therapeutic stimulus, the irradiance should peak in the yellow part of the spectrum. However, with the incandescent light source, it peaked in the red. Thus with the prior art devices, if you gave a subject a needed yellow stimulus, the subject was actually getting the effect of a red stimulus with diminished therapeutic results. A second example is seen with a fuchsia filter which passes an equal amount of deep red at one end of the spectrum and violet at the opposite end of the spectrum. The incandescent source of prior art devices emits so little violet that the actual stimulatory effect of the prior art fuchsia filter was that of red which made the fuchsia stimulus totally ineffective therapeutically. The incandescent source emits so little blue and violet that the those prior art blue and violet filters were also very poor therapeutic stimulators. The second problem users had was the biological inactiveness of photons generated from the prior art incandescent light source. Even when a true color stimulus could be obtained, which was possible with a red filter for example, therapy was still ineffective with many subjects. The third problem was that users had to make a subjective determination of the needed color stimulus. Users were schooled in the art, and did know basic rules of thumb for color stimulus prescribing, such as the use of red as a sensory stimulus to counteract amblyopia, and the use of blue as a sensory depressant to counteract headaches. However, many subjects had conflicting" symptoms, for example an amblyope with a headache. In those cases, it was impossible to determine with accuracy, the color stimulus needed. The prior art lacked an objective test for determining proper color stimuli. DISCLOSURE OF INVENTION A light stimulator device which tests and therapeutically stimulates the neurovisual system by visible light. It utilizes a balanced spectrum, magnetic, plasmatic light source with different color filters and different apertures interposed between the light source and the subject's eyes. The flash rate of the light source can be continuously varied to provide for diagnostic CFF testing. Several objects and advantages of this invention are: to provide an improved light stimulator device for rehabilitating the neurovisual system, to provide a light source which produces a balanced color spectrum and thus creates truer and more effective color stimuli, to provide an improved light source which produces more effective, biologically active photons, and to provide a mechanism which objectively determines the correct color stimulus for a given subject. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 shows a perspective side view of a device according to the invention. Fig. 2 shows a side view of the inside of such device. Fig. 3 shows an enlarged side view of a light source used in such device. Fig. 4 shows a front view of an aperture wheel used in such device. Fig. 5 shows a front view of a filter wheel used in such device. Fig. 6 shows an exposed side view of a light source, an optional electromagnet, and an optional motorized shutter used in such device. Fig. 7 shows a graph of the "Visible Spectrum Of Sun VS visible Spectrum of Incandescent Lamp". Fig. 8 shows a graph of the "Relative Irradiance Through A Yellow Filter Produced By An Incandescent Light Source VS A Balanced Spectrum Light Source". Fig. 9 shows a graph of the "Relative Irradiance Through A Fuchsia Filter Produced By An Incandescent Light Source VS A Balanced Spectrum Light Source". BEST MODE FOR CARRYING OUT THE INVENTION Fig. 1 shows a perspective side view of an improved light stimulator device according to a preferred embodiment of the invention. The improved light stimulator consists of a housing 10 (76 cm long, 46 cm wide, and 46 cm high) which sits on a base 12 (30 cm long, 30 cm wide, and 11 cm high) and has an open front 14 which serves as a viewing area whereby the eyes of the subject 15 look over a distance of about 48 cm to the collimating lens 30 (see Fig. 2) . A control panel 16 exposes the edges of an aperture wheel 18 and a color filter wheel 20. Said edges can be grasped and said wheels can be turned around axis pin 21 (see Fig. 2) . Aperture wheel 18, shown in Fig. 4 is circular (35.5 cm in diameter) and contains a large viewing aperture 46 (2.5 cm in diameter) for use when a full therapeutic stimulus is needed. It also contains a small CFF (Critical Flicker Fusion) testing aperture 48 (1 mm in diameter) for use in testing the viewer's CFF for a given color. CFF is the flash rate (flashes per second) at which a flashing light with a gradually increasing flash rate first appears to be steady to a subject viewing the light. That is, the flashes will appear to fuse. When aperture wheel 18 is turned, it pivots around axis pin 21 and the selected aperture is brought into alignment with a light path 28 and held into position by detents in aperture wheel 18. Color filter wheel 20, shown in Fig. 5 is circular (35.5 cm in diameter) and contains 12 color filters which are: white, ruby, red, orange, yellow, yellow green, green, blue green, blue, indigo, violet, and fuchsia. When color filter wheel 20 is turned, it pivots around axis pin 21 and the selected color filter is brought into alignment with light path 28 and held into position by detents in color filter wheel 20. Control panel 16 also holds a power switch 22 which turns on a light source 32 (see Fig. 2) , a flash rate control dial 24 which adjusts the flash rate of light source 32 from 5 Hz to 55 Hz, and a digital flash rate display 26 (LED or other suitable readout) which indicates the flash rate to 0.1 Hz. Fig. 2 shows a side view of the inside of the improved light stimulator taken from its right side as seen by the eyes of subject 15 and assuming control panel 16 and the entire right side were removed. Light source 32, which produces light which travels along light path 28, is attached to and powered by a light source power circuit 34. Light path 28 first passes through safety filters 35 which are a UV (ultra violet) blocking filter which screens from the light path 28 all UV light and a neutral density filter which uniformly reduces any excess irradiance so that the maximum light intensity at the point just after leaving safety filters 35 is 11 lumen sec/Ft squared. Safety filters 35 are held in place by a safety collar 33. Light path 28 then passes through color filter wheel 20, then aperture wheel 18, then collimating lens 30 (convex lens of approximately 18 dioptors) which makes the light rays parallel, and continues into eyes of subject 15. Collimating lens 30 is held by a collimating lens holder 29 which is attached to an inner wall 31. The distance between light source 32 and collimating lens 30 is approximately 10 cm. Light source 32 is detailed in Fig. 3. A glass envelope 36 encloses a glass discharge tube 38 which is coiled in 7 multiple turns and contains gas, preferably a mixture which produces a full, balanced spectrum of light, approximating the light spectrum of sunlight at sea level at midday. Said type of tube is available as model #FX- 94c from EG & G Electro-Optics, Salem, Mass, U.S.A. Such gas is in contact with an anode 42 and a cathode 44 at opposite ends of tube 38. Both electrodes are attached to and powered by light source power circuit 34. Said type of power circuit is available as model TM-12A from EG & G Electro-Optics. When light source power circuit 34 is turned on by power switch 22 (shown in Fig. 1) , the gas inside glass discharge tube 38 ionizes to create plasma which emits light. The multiple turns in glass discharge tube 38 increase the magnetic field within the plasma. This increase in magnetism is due to the principle of electromagnetis that coiling an electrical current pathway increases the magnetic field associated with the current. Light source power circuit 34 supplies high- voltage pulses to glass discharge tube 38 so as to create light pulses at a rate of 5 Hz to 55 Hz. This flash rate can be continuously and precisely varied in increments of 0.1 flash per second. The preferred embodiment of this invention provides a controllable, continuously variable flash rate produced by an electrical start and stop mechanism within light source power circuit 34. An alternative method would be the use of a motorized shutter 50 in front of light source : 32 as shown in Fig. 6. The preferred embodiment of this invention provides for an increased self generating magnetic field within light source 32 by placing multiple, coils in the glass discharge tube 38. An alternative method to create a magnetic field which would encompass light source 32 would be an adjacent electromagnet 52 as shown in Fig. 6. Other embodiments of this invention would include different aperture sizes and shapes in aperture wheel 18, a motorized aperture holder in place of aperture wheel 18, a motorized color filter holder in place of color filter wheel 20, and any light source which could be interrupted at a controllable, variable rate in conjunction with the use of color filters. To operate this improved light stimulator, power switch 22 is turned on, activating light source 32. An operator adjusts flash rate control dial 24 to a flash rate of 10.5 Hz, indicated by display 26. To determine the proper therapeutic color stimulus, the operator performs the following steps: (1) Adjust aperture wheel 18 so as to position small CFF testing aperture 48 in light path 28. (2) Adjust color filter wheel 20 so as to position the first color filter (ruby) in light path 28. (3) Adjust dial 24 to provide a flash rate of approximately 10.5 Hz. (4) Place eyes of subject 15 at beginning of open front 14 and have the subject look at collimating lens 30. (5) Ask the subject to say "now" when the flashing light appears to stop flashing and shine steadily. (6) Gradually and continuously increase the flash rate until the subject says "now". (7) Record the flash rate at this "now" point. This is the subject's CFF for this color. (8) Repeat this procedure for all the colors contained in color filter wheel 20 except white. White is used only in conjunction with auxiliary filters placed directly on eyes of subject 15. The white filter is included in this device for research only for those operators schooled in the art. The color at which the subject has the lowest CFF is the color which that subject needs as a therapeutic stimulus. The same results as above may be obtained by starting at a 55 Hz flash rate where the subject initially sees the light as steady and gradually reduce the flash rate to the point where the subject sees it as flickering. This point would then be recorded as the subject's CFF for that color. To operate the improved light stimulator in its therapeutic mode, the operator performs the following steps: (1) Adjust wheel 18 so as to position large viewing aperture 46 in light path 28. (2) Adjust color filter wheel 20 so as to position the indicated color filter in light path 28. (3) Adjust flash rate control dial 24 to a flash rate of approximately 10.5 Hz. (4) Place eyes of subject 15 at beginning of open front 14 and have the subject look at collimating lens 30. This allows for the neurovisual pathways to be stimulated and rehabilitated to normal functioning. There are several factors which make my device an improvement over the prior art light stimulators: Prior art light stimulators produced unsatisfactory therapeutic effectiveness due to untrue color stimuli created from the incandescent light source used. Incandescent lamps do not create a natural, balanced color spectrum (see Fig. 7) . This produces disproportionate irradiance at different wavelengths within a band of color and therefore the corresponding photoreceptors in the retina do not get the amount of stimulus needed for adequate therapeutic effects (see Fig. 8 and Fig. 9) . My improved light stimulator uses a balanced spectrum light source comparable to sunlight (see Fig. 7) . This creates true colors which corresponded directly with the targeted retinal receptors and therefore create a much greater therapeutic effect (see Fig. 8 and Fig. 9) . The second problem users found with prior art devices was again related to the incandescent light source. Even when a true color stimulus could be obtained, which was possible with some color filters, like the red filter for example, therapy was still ineffective with many subjects. The incandescently created photons did not have the strong therapeutically stimulating effect which was needed. My improved light stimulator uses a plasma light source which I have empirically verified to create photons which produce much better therapeutic results. The multiple turns in the glass discharge tube increase the magnetic field within the plasma which I have also observed to further add to the therapeutic effectiveness of the photons emitted. Although not wishing to be bound, I believe that photons created out of a natural, magnetic, plasmatic environment, similar to that produced by sunlight and my light source, have an intensified subtle biomagnetic field surrounding them that present technology has not yet been able to measure. I further believe that photons holding said biofield have a greater affinity to affect the human body by interaction with the body's own biological stimulus of sunlight. Whatever the reason, my magnetic, plasmatic light source produces a far greater therapeutic effect than the prior art incandescent sources. Plasma light sources and multiple coiled tubes have been used in other industries, such as photography, but they have never before been used in a therapeutic mode, especially to increase the effectiveness of light therapy. The prior art devices contained no mechanism to objectively determine the correct waveband color stimulus for a given subject. My improved light stimulator device utilizes a test for CFF to determine the therapeutic color stimulus needed for a given subject. The CFF is a critical threshold which is directly linked to the functioning of the visual pathway. A low CFF for a given color stimulus indicates a diminished functioning of the neural pathway associated with that color's retinal receptor. I have found that stimulating the subject's eyes with the tested low CFF producing color stimulus will rehabilitate the diminished neural pathway, restoring its CFF to normal, and significantly reducing or eliminating the accompanying symptoms. Typical symptoms relieved are amblyopia, photophobia, learning disabilities, headaches, and other visually related problems, etc. I have observed that the diminished neurovisual pathway can be re-educated by repetitive stimuli to proper functioning. The principle here is analagous to the "Law of Facilitation" which states that each succeeding nerve impulse meets with less resistance. Flashing light sources were used in some prior art devices, but there has never before been a device that used a light source that had a controllable, continuously variable flash rate, or utilized a CFF test to determine the therapeutic stimuli. Thus the reader will see that the light stimulator of this invention provides for a more effective light stimulus than those of the prior art. This is because it produces a more natural, balanced color spectrum which creates more therapeutically effective color stimuli. It produces a more effective, biologically active light by creating photons out of a natural, magnetic, plasmatic environment. It provides an objective CFF test for determining the correct color stimulus for a given subject. While my above description contains many specifications, these should not be construed as limitations on the scope of the invention, but rather as an exemplification of one preferred embodiment thereof. Many other variations are possible. For example, my invention can be made of any size, shape, color, material, or component combination. My invention can be used in any embodiment where a more biologically active light stimulus, either visible or invisible, is needed. My invention could be used to stimulate the whole or any part of a human, animal, plant, mineral, chemical composition, or any other material, matter, or substance. The light source used can be steady or flash at any rate. Accordingly, the scope of my invention should be determined not by the embodiment illustrated, but by the the appended claims and their legal equivalents.

Claims: LIGHT STIMULATOR CLAIMS What is claimed as invention is: 1. A device for testing or providing a therapeutic stimulus to a subject, comprising: means for shining a plasma light source, at an effective level, into a subject's eyes, and means for selectively interposing any one of a plurality of color filters between said light source and said subject's eyes. 2. The device of claim 1, further including means for interrupting said light source at a controllable, continuously variable rate. 3. The device of claim 2, wherein said means for interrupting said light source at a controllable, continuously variable rate is a motorized shutter between said light source and said subject's eyes. 4. The device of claim 2, wherein said means for interrupting said light source at a controllable, continuously variable rate, is a means of electrically starting and stopping said light source. 5. The device of claim 1, wherein said light source is arranged to emit a light spectrum which approximates the light emission curve of sunlight recorded at sea level during midday. 6. The device of claim 1, further including means for selectively interposing anyone of a plurality of apertures of different sizes and shapes between said light source and said subject's eyes. 7. The device of claim 6, wherein said means for selectively interposing any one of a plurality of said apertures between said light source and said subject's eyes is a motorized aperture holder. 8. The device of claim 1, wherein said means for selectively interposing any one of a plurality of said color filters between said light source and said subject's eyes is a motorized filter holder. 9. The device of claim 1, further including means for providing a self generating magnetic field within said light source. 10. The device of claim 1, further including means for providing a magnetic field encompassing said light source. 11. A device for testing or providing a therapeutic stimulus to a subject, comprising: means for shining a light source into a subject's eyes, means for selectively interposing any one of a plurality of color filters between said light source and said subject's eyes, and means for interrupting said light source at a controllable, continuously variable rate. 12. The device of claim 11, wherein said means for interrupting said light source at a controllable, continuously variable rate is a motorized shutter between said light source and said subject's eyes. 13. The device of claim 11, wherein said means for interrupting said light source at a controllable, continuously variable rate is a means of electrically starting and stopping said light source. 14. A method of testing or providing a therapeutic stimulus to a subject comprising: (a) providing a plasma light source, (b) providing a color filter between said light source and said subject, and (c) interrupting said light source at a relatively slow initial rate and gradually increasing said rate until said subject sees said light source as continuous. 15. The method of claim 14, further including repeating said steps (b) to (c) with filters of different colors. 16. A method of testing or providing a therapeutic stimulus to a subject comprising: (a) providing a plasma light source, (b) providing a color filter between said light source and said subject, and (c) interrupting said light source at a relatively fast initial rate so that said subject sees said light source as continuous, and gradually decreasing said rate until said subject sees said light source as flickering. 17. The method of claim 16, further including repeating said steps (b) to (c) with filters of different colors.

Inventors: DOWNING JOHN CHARLES, DOWNING, JOHN, CHARLES
Applicants: DOWNING JOHN CHARLES, DOWNING, JOHN, CHARLES
Application year: 1988
Main classification: A61B3
IPC codes: A61B3, A61B5, A61F9, A61M21, A61N1, A61N5