The retina is the layer that transmits image stimuli to the brain via the optic nerve. 'Retinal detachment' is the separation of the neurosensory retina, that is, the nerve-sensory layer, from the RPE by the accumulation of fluid between the retinal pigment epithelium (RPE), the outermost layer of the retina, and the photoreceptor (light sensitive) layers. Loss of visual function in the detached retina can progress to complete vision loss. Surgical methods are applied in rhegmatogenous (torn) retinal detachments. These are external pressure on the sclera with a permanent or temporary material, closure of the tear using laser, cryo or diathermy, intraocular tamponade (pneumatic retinopexy) and vitrectomy operations.