By Hossein Ameri, James D. Weiland, Mark S. Humayun (auth.), Mark S. Humayun, James D. Weiland, Gerald Chader, Elias Greenbaum (eds.)
Artificial sight is a frontier sector of recent ophthalmology combining the multidisciplinary talents of surgical ophthalmology, biomedical engineering, organic physics, and psychophysical checking out. Many clinical, engineering, and surgical demanding situations needs to be surmounted ahead of frequent sensible functions should be discovered. The objective of Artificial Sight is to summarize the state of the art study during this interesting sector, and to explain many of the present methods and tasks that can support sufferers in a medical atmosphere.
The Editors are lively researchers within the fields of synthetic sight, biomedical engineering and organic physics. they've got bought various expert awards and popularity for his or her paintings. the bogus sight workforce on the Doheny Eye Institute, led by way of Dr. Mark Humayun, is a global chief during this quarter of biomedical engineering and scientific research.
- Introduces and assesses the state-of-the-art for a huge viewers of biomedical engineers, biophysicists, and scientific researchers
- Describes advances in microelectronics, microfabrication, surgical implantation, and psychophysical trying out of visible prostheses
- Outlines the promise of man-made sight and the demanding situations that needs to be met
Read or Download Artificial Sight: Basic Research, Biomedical Engineering, and Clinical Advances PDF
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Extra info for Artificial Sight: Basic Research, Biomedical Engineering, and Clinical Advances
Direct retinal stimulation in five blind subjects (secondary to RP, AMD, or unspecified retinal degeneration from birth) with visual acuity of little or no light perception resulted in perception of phosphenes in all subjects . When the retina was stimulated with intraocular probes held very close to the retina and ranging from 50 to 200 in diameter, a typical stimulus pulse of 300–800 A and 1–4 milliseconds in duration was required to elicit a phosphene. All subjects were able to localize the stimuli and give a detailed description of visual phenomena, except one subject with unspecified retinal degeneration and who had been blind since birth.
Thus, one can 36 Fujikado et al. expect that patterned STS via an array of suprachoroidal electrodes will provide patterned phosphenes to RP patients. Artificial Vision in Rabbit by STS We used rabbits to develop the surgical procedure for implanting the electrode and for the functional assessment of STS method . 3a). The multichannel electrode array was then implanted into the scleral pocket and sutured with 5-0 Dacron onto the sclera just above the pocket. The counter electrode was a platinum (Pt) wire coated with polyurethane resin and exposed at the tip.
Artificial Vision 37 strip 3 mm wide, 4 mm long, and 180 m thick. The dimensions of each electrode were height above the surface = 120–130 m; diameter = 250 m; distance between electrodes = 500 rmm. Their impedance in saline was approximately 10 k at 1 kHz. The bundle of insulated leads from the microarray was also sutured at the limbus with 5-0 Dacron. , Sarasota FL USA) to the microelectrode array. The recording electrode was a screw in the skull bone above the visual cortex. 5 ms duration. The direction of the current was set for inward-flowing currents (electrode array was positive and reference electrode was negative).