Patents Assigned to Visual Pathways, Inc.
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Patent number: 7360895Abstract: An ocular fundus imager automatically aligns fundus illuminating rays to enter the pupil and to prevent corneal reflections from obscuring the fundus image produced. Focusing the produced fundus image is automatically performed using a pair of video sensors and is based upon the fundus image itself. A head restraint is used to reduce the gross alignment between the optical system and the patient's pupil.Type: GrantFiled: June 14, 2004Date of Patent: April 22, 2008Assignee: Visual Pathways, Inc.Inventors: Tom N. Cornsweet, Gary F. Buck, Paul R. Peterson
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Patent number: 7156518Abstract: A method is disclosed for quantifying the extent a cataract impairs vision in an eye having a pupil, an ocular lens, and a retina. The method includes illuminating a localized region of the retina such that light is reflected from the localized region and is transmitted through the ocular lens. A portion of the reflected light is scattered by the cataract associated with the ocular lens. Light reflected from the localized region of the retina is collected, and the amount of scatter is measured so as to quantify the extent the scatter impairs vision of the eye.Type: GrantFiled: November 10, 2004Date of Patent: January 2, 2007Assignee: Visual Pathways, Inc.Inventors: Tom N. Cornsweet, Paul Peterson
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Patent number: 7025459Abstract: An ocular fundus imager (8) automatically aligns fundus illuminating rays to enter the pupil (P) and to prevent corneal reflections from obscuring the fundus image produced. Focusing the produced fundus image is automatically performed and is based upon the fundus image iself. A head restraint for the patient undergoing examination is in the form of a pair of spectacles which is not only easy to use accurately but significantly reduce the gross alignment between the optical system (8) and the patent's pupil (P).Type: GrantFiled: July 6, 2001Date of Patent: April 11, 2006Assignee: Visual Pathways, Inc.Inventors: Tom N. Cornsweet, Gary F. Buck
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Patent number: 6836337Abstract: The glucose concentration in the bloodstream is directly correlated to the concentration of glucose in the aqueous humor. Furthermore, variation in the glucose concentration in the aqueous humor will cause like variations in its index of refraction. Thus, by measuring the refractive index of the aqueous humor, the glucose concentration in the blood can be determined. The refractive index of the aqueous humor can be measured by interferometry. In various embodiments of the invention that employ interferometry, two beams may be directed onto the eye and caused to interfere, thereby producing a fringe pattern. The fringe pattern may be analyzed to determine the index of refraction of the aqueous humor in the eye and the glucose concentration therein. The glucose level in the blood can be ascertained from this information.Type: GrantFiled: September 19, 2002Date of Patent: December 28, 2004Assignee: Visual Pathways, Inc.Inventor: Tom N. Cornsweet
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Patent number: 6834958Abstract: A method is disclosed for quantifying the extent a cataract impairs vision in an eye having a pupil, an ocular lens, and a retina. The method includes illuminating a localized region of the retina such that light is reflected from the localized region and is transmitted through the ocular lens. A portion of the reflected light is scattered by the cataract associated with the ocular lens. Light reflected from the localized region of the retina is collected, and the amount of scatter is measured so as to quantify the extent the scatter impairs vision of the eye.Type: GrantFiled: July 23, 2002Date of Patent: December 28, 2004Assignee: Visual Pathways, Inc.Inventors: Tom N. Cornsweet, Paul Peterson
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Patent number: 6296358Abstract: An ocular fundus imager automatically aligns fundus illuminating rays to enter the pupil and to prevent corneal reflections from obscuring the fundus image produced. Focusing the produced fundus image is automatically performed and is based upon the fundus image itself. A head restraint for the patient undergoing examination is in the form of a pair of spectacles which is not only easy to use accurately but significantly reduces the gross alignment between the optical system and the patient's pupil.Type: GrantFiled: August 25, 2000Date of Patent: October 2, 2001Assignee: Visual Pathways, Inc.Inventors: Tom N. Cornsweet, Gary F. Buck