Age-related macular degeneration (AMD) is a leading cause of vision loss, impacting over 5 million individuals globally. Fortunately, recent advancements have emerged in the form of the Prima system, which has received approval in Europe and is currently under review by the FDA in the United States. This revolutionary technology merges a retinal implant with specialized eyeglasses equipped with a camera, providing a new avenue for patients who experience central vision loss due to advanced AMD. After participating in training sessions, over 80% of users reported improved abilities to read, solve crosswords, and even utilize their smartphones.
At the core of the Prima system is its innovative approach to vision restoration. The retina consists of three layers of cells, with photoreceptors responsible for converting light into electrical signals. In cases of AMD, these photoreceptors deteriorate, leading to vision impairment. The Prima implant replaces the lost photoreceptors and transmits visual data directly to the remaining healthy retinal circuitry, allowing the brain to process the signals effectively. Frank Brodie, an ophthalmologist at the University of California, San Francisco, emphasizes the system’s reliance on the body’s natural mechanisms to relay information, enhancing the potential for vision recovery.
The Prima system operates through a series of sophisticated components. The glasses feature a mini front-facing camera that captures real-time video at around five megapixels and 30 frames per second, akin to standard television quality. This visual feed is sent to a compact processor via fiber-optic cable, where it is transformed into infrared light signals. These signals are then directed back to the glasses, allowing wearers to adjust settings like contrast and brightness. The glasses utilize a laser projector that emits pulses of near-infrared light, which penetrate the eye and reach the retinal implant. Comprising 378 pixels, the implant effectively converts light into electrical currents, stimulating healthy retinal cells and sending signals to the brain. Notably, the device is self-powered through photovoltaic cells, eliminating the need for an external battery. With this groundbreaking technology, the future looks promising for those suffering from AMD.
Source: This implant can restore sight for patients with macular degeneration via MIT Technology Review