{"id":564,"date":"2015-12-17T11:17:55","date_gmt":"2015-12-17T19:17:55","guid":{"rendered":"https:\/\/keck.usc.edu\/news\/usc-eye-institute-researchers-discover-a-way-to-improve-image-sharpness-for-blind-people-with-retinal-implants\/"},"modified":"2023-11-19T12:08:40","modified_gmt":"2023-11-19T20:08:40","slug":"usc-eye-institute-researchers-discover-a-way-to-improve-image-sharpness-for-blind-people-with-retinal-implants","status":"publish","type":"post","link":"https:\/\/keck.usc.edu\/news\/usc-eye-institute-researchers-discover-a-way-to-improve-image-sharpness-for-blind-people-with-retinal-implants\/","title":{"rendered":"USC Eye Institute researchers discover a way to improve image sharpness for blind people with retinal implants"},"content":{"rendered":"\n \n \n\n\n\n\n\n\n\n
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\n\n \n Press Release<\/span>\n\n\n\n<\/div>\n \n \n
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USC Eye Institute researchers discover a way to improve image sharpness for blind people with retinal implants<\/h1>\n\n\n<\/div>\n \n \n
\n Meg Aldrich<\/span>\n \n December 17, 2015<\/span>\n <\/div>\n \n \n
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\"eyeretina\"
\nLonger pulses of electrical current allow patients to see <\/em>focused spots of light<\/em>
\nRetinal implants that deliver longer pulses of electrical current may noticeably improve image sharpness for individuals who have lost their sight due to retinitis pigmentosa, according to a new study by researchers from the USC Eye Institute<\/a> and USC Viterbi School of Engineering<\/a>.
\nThe research will be published in the peer-reviewed journal Science Translational Medicine<\/em> online on\u00a0December 16.
\nRetinitis pigmentosa (RP) is an inherited disease of the eye that causes blindness through gradual degeneration of photoreceptors, the light-sensing cells in the retina. The disease affects about one in 4,000 people. The Argus II retinal implant, also known as the \u2018bionic eye\u2019 was developed by a team of ophthalmologists and engineers at USC.
\nRetinal implants (artificial retinas) give people with RP the ability to perceive light, using a system that includes a video camera mounted on a pair of eyeglasses, a video processing unit that transforms images from the camera into wirelessly transmitted electronic signals, and an implanted array of electrodes to stimulate visual neurons.
\nRetinal implants have enabled blind individuals to detect motion and locate large objects. However, because the implants may unintentionally stimulate axons in the retina, patients sometimes see large oblong shapes of light that reduce the quality of their vision. In order for patients to see more clearly, the images created by the implant should be composed of focal spots of light.
\nCurrent implant technology stimulates the retina with brief pulses of electrical current roughly 0.5 millisecond (ms) in duration. The researchers found that increasing the duration of the stimulus pulses allows visualization of distinct focal spots of light.
\n\u201cThis is a huge step forward in helping restore sight for people with retinitis pigmentosa,\u201d said Andrew Weitz, PhD, assistant professor of research ophthalmology. \u201cBeing able to create focused spots of light is important. Think of each light spot as a pixel in an image. By arranging many light spots into the shape of an object, we can generate sharp images of that object. For those of us who wear glasses, imagine the difference between trying to read a distant neon sign with and without your glasses on. For people with retinal implants, being able to see more clearly should have a big impact on their ability to recognize objects and navigate their environments. These improvements in vision can really boost a person\u2019s sense of independence and confidence.\u201d
\nThe researchers tested various stimulus pulse durations in an animal model and validated their findings in a patient with an early version of the Argus retinal implant (Second Sight Medical Products, Inc.). The results indicated that longer pulse durations allowed the retina to be stimulated more precisely. In the animal model, all pulses 8 ms and shorter activated axons, obscuring the ability to generate a focal spot of light. Sixteen-millisecond pulses also stimulated axons but to a much lesser extent. Pulses 25 ms and longer produced no evidence of axonal stimulation, instead resulting in focal spots of light.
\n

\"USC
USC researchers found that longer pulse durations allowed the retina to be stimulated more precisely.<\/figcaption><\/figure>\u201cOur findings further support that it is possible for patients with RP to see forms using artificial vision,\u201d said James Weiland, PhD, professor of ophthalmology and biomedical engineering. \u201cThis makes a strong case for developing high-resolution retinal implants.\u201d
\nThis research was conducted through a partnership between the USC Eye Institute and USC\u2019s schools of medicine and engineering: the Viterbi School of Engineering Department of Biomedical Engineering and Ming Hsieh Department of Electrical Engineering; Keck School of Medicine\u2019s Departments of Ophthalmology, and of Physiology and Biophysics; and device manufacturer Second Sight Medical Products Inc., in Sylmar, CA.
\nResearchers who contributed to the study include: Andrew C. Weitz (Department of Ophthalmology, Department of Biomedical Engineering); Devyani Nanduri (Department of Biomedical Engineering); Matthew R. Behrend (Ming Hsieh Department of Electrical Engineering); Alejandra Gonzalez-Calle (Department of Biomedical Engineering); Robert J. Greenberg (Second Sight Medical Products Inc.,); Mark S. Humayun<\/a> (Department of Ophthalmology, Department of Biomedical Engineering); Robert H. Chow (Department of Physiology and Biophysics, Department of Biomedical Engineering); and James D. Weiland (Department of Ophthalmology, Department of Biomedical Engineering).
\nThis research was funded in part by the National Science Foundation, National Institutes of Health (grants EY022931 and GM085791), Beckman Initiative for Macular Research, and Second Sight Medical Products Inc.<\/p>\n\n\n\n<\/div>\n <\/div>\n\n\n <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":47,"featured_media":565,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[21,20],"class_list":["post-564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-release","tag-ophthalmology","tag-research"],"acf":[],"yoast_head":"\nUSC Eye Institute researchers discover a way to improve image sharpness for blind people with retinal implants<\/title>\n<meta name=\"robots\" content=\"index, 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