Retinal Implants: An Overview
Retinal implants are advanced biomedical devices designed to restore partial vision in individuals suffering from severe retinal degenerative diseases, such as retinitis pigmentosa and age-related macular degeneration. These conditions damage photoreceptor cells in the retina, preventing the normal conversion of light into neural signals. Retinal implants aim to bypass damaged photoreceptors by directly stimulating the remaining healthy retinal neurons, enabling visual information to be transmitted to the brain.
The human retina functions as a complex neural network that converts light into electrical impulses. When photoreceptors fail but downstream retinal cells remain functional, retinal implants can exploit this pathway. Most systems work by capturing visual information through an external camera, processing the images, and transmitting electrical signals to electrodes implanted in or near the retina. These electrodes stimulate retinal cells, producing visual perceptions known as phosphenes—patterns of light that the brain learns to interpret as shapes and…
