There is no documented case in the literature of degenerative retinoschisis itself (as opposed to the occasional situation of retinal detachment complicating retinoschisis) in which the splitting of the retina has progressed through the fovea. There is no clinical utility in differentiating between typical and reticular retinoschisis. Degenerative retinoschisis is not known to be a genetically inherited condition. There is always vision loss in the region of the schisis as the sensory retina is separated from the ganglion layer. But as the loss is in the periphery, it goes unnoticed. It is the very rare schisis that encroaches on the macula where retinopexy is then properly used. Hereditary retinoschisis
Hereditary retinoschisis is derived from a defective retinoschisin protein, which is due to an X-linked genetic defect. The genetic form of this disease usually starts during childhood and is called  X-linked Juvenile Retinoschisis (XLRS) or Congenital Retinoschisis. Affected males are usually identified in grade school, but occasionally are identified as young infants. It is estimated that this much less common form of retinoschisis affects one in 5,000 to 25,000 individuals, primarily young males. Schisis is derived from the Greek word meaning splitting, describing the splitting of the retinal layers from each other. However, schisis is a word fragment, and the term retinoschisis should be used, as should the term iridoschisis when describing splitting of the iris. If the retinoschisis involves the macula, then the high-resolution central area of vision used to view detail is lost, and this is one form of macular disease.
Retinoschisis is an eye disease characterized by the abnormal splitting of the retinas neurosensory layers, usually in the outer plexiform layer. Retinoschisis can be divided into degenerative forms which are very common and almost exclusively involve the peripheral retina and hereditary forms which are rare and involve the central retina and sometimes the peripheral retina. The degenerative forms are asymptomatic  and involve the peripheral retina only and do not affect the visual acuity. Some rarer forms result in a loss of vision in the corresponding visual field.Almost all cases are X-linked recessive and caused by a mutation in the retinoschisin gene (RS1). Classification
Hereditary
X linked juvenile retinoschisis
Familial foveal retinoschisis
Tractional
Exudative
Secondary to Optic disc pit
Degenerative
Typical
Reticular

Degenerative retinoschisis
This type of retinoschisis is very common with a prevalence of up to 7 percent in normal persons. Its cause is unknown. It can easily be confused with retinal detachment by the non-expert observer and in difficult cases even the expert may have difficulty differentiating the two. Such differentiation is important since retinal detachment almost always requires treatment while retinoschisis never itself requires treatment and leads to retinal detachment (and hence to visual loss) only occasionally. Unfortunately one still sees cases of uncomplicated retinoschisis treated by laser retinopexy or cryopexy in an attempt to stop its progression towards the macula. Such treatments are not only ineffective but unnecessarily risk complications.