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The quality of vision expected from a retinal implant is largely based on the maximum spatial resolution of the implant. Current prototypes of retinal implants are capable of providing low resolution, pixelated images. "State-of-the-art" retinal implants incorporate 60-100 channels, sufficient for basic object discrimination and recognition tasks.
Photovoltaic retinal prosthesis is a technology for restoration of sight to patients blinded by degenerative retinal diseases, such as retinitis pigmentosa and age-related macular degeneration (AMD), when patients lose the 'image capturing' photoreceptors, but neurons in the 'image-processing' inner retinal layers are relatively well-preserved. [1]
Argus retinal prosthesis, also known as a bionic eye, is an electronic retinal implant manufactured by the American company Second Sight Medical Products. It is used as a visual prosthesis to improve the vision of people with severe cases of retinitis pigmentosa .
The ability to give sight to a blind person via a bionic eye depends on the circumstances surrounding the loss of sight. For retinal prostheses, which are the most prevalent visual prosthetic under development (due to ease of access to the retina among other considerations), patients with vision loss due to degeneration of photoreceptors (retinitis pigmentosa, choroideremia, geographic atrophy ...
Regenerative processes may have applications in humans for treating degenerative retinal diseases, such as retinitis pigmentosa. While mammals, such as humans and mice, lack the innate ability to regenerate the retina, lower vertebrates, such as teleost fish and salamanders, are capable of regenerating lost retinal tissue in the event of damage.
Humayun co-invented the Argus II retinal prosthesis, [23] a retinal implant designed to help patients with genetic retinitis pigmentosa. [24] [25] More than 30 clinical trial participants in Argus II trial launched in 2007 at sites in the U.S. and Europe. It was approved by the FDA in February 2013. [26]
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Intravitreal implants are micro device-like inserts injected into the posterior segment of the eye to treat retinal diseases releasing therapeutic drugs at a set rate over a desired period of time. [ 1 ] [ 2 ] The posterior segment of the eye consists of the sclera , choroid , fovea , vitreous humor , optic nerve , and retina .