"Retinal tissue" refers to the layer of cells that lines the back of the eye, known as the retina. It is responsible for detecting light and converting it into signals that the brain can understand, allowing us to see. Full definition
The litters were also exposed to high levels of oxygen, which causes a loss of blood vessels in retinal tissue. (discovermagazine.com)
There are experimental attempts to develop electronic implants and to use stem cells to grow new retinal tissues to restore sight, but there is currently no commercial treatment available. (newscientist.com)
One result was the formation of lens and retinal tissue outside the head. (sciencemag.org)