The retina is the eye's multi-layered sensory tissue. When the light pass the eye's lens, the image will be reflected on the retina. The retina converts the image to visual signals - these signals will travel through the optic nerves, and then reach the brain.
The retina has rich blood supply, and it contains interconnected neuron layers. Some neurons can sense dim light, while other neurons can sense bright light. The retina processes these neural signals and pass them to the brain.
Retinal problems often cause serious vision impairment. The common retina diseases include: retina detachment, macular degeneration, macular holes, diabetic retinopathy, epiretinal membranes, central serous retinopathy, ocular tumors.