Retinal detachment occurs when the outer membrane of the retina (called the retinal pigment epithelium) separates from the inner layer (sensory retina). This detachment can occur due to various reasons such as strong myopia or degenerative atrophic processes. Where the retina is detached, fluid accumulates between the layers and segment blindness occurs. Two of the most crucial signs that may alert the patient of a detached retina are flashing lights and floaters. Treatment for most patients is surgery.