During normal aging, the thin supporting threads of the vitreous become detached from the surface of the retina. Sometimes a small piece of retina may become detached with a thread. The laser burns seal the edges of the retinal hole and prevent retinal detachment from developing. The retina is a thin, transparent membrane surrounding the vitreous body. It is the part of the eye that actually sees.
Light is absorbed by the sensory cells in the outer layers of the retina.
There are two kinds of sensory cells, cones and rods . Cones function best in daylight, rods in twilight and dark. We see colors through cone function. Rods do not react to different colors. They see only different shades of grey.