*Hereditary *X linked juvenile<unk>  *Familial foveal<unk>  *Tractional *Exudative *Secondary to Optic disc pit *Degenerative *Typical *Reticular Degenerative<unk>  This type of<unk>  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<unk>  never itself requires treatment and leads to retinal detachment (and hence to visual loss) only occasionally. Unfortunately one still sees cases of uncomplicated<unk>  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. There is no documented case in the literature of degenerative<unk>  itself (as opposed to the occasional situation of retinal detachment complicating<unk>  in which the splitting of the retina has progressed through the fovea. There is no clinical utility in differentiating between typical and reticular<unk> . Degenerative<unk>  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<unk>  Hereditary<unk>  is derived from a defective<unk>  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<unk>  <unk>  or Congenital<unk> . 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<unk>  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<unk>  should be used, as should the term iridoschisis when describing splitting of the iris. If the<unk>  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. Although it might be described by some as a "degeneration", the term macular degeneration should be reserved for the specific disease "age-related macular degeneration". Very few affected individuals go completely blind from<unk> , but some sufferers have very limited reading vision and are "legally blind". Visual acuity can be reduced to less than 20/200 in both eyes. Individuals affected by<unk>  are at an increased risk for retinal detachment and eye hemorrhage, among other potential complications.<unk>  causes acuity loss in the center of the visual field through the formation of tiny cysts in the retina, often forming a "spoke-wheel" pattern that can be very subtle. The cysts are usually only detectable by a trained clinician. In some cases vision cannot be improved by glasses, as the nerve tissue itself is damaged by these cysts. The National Eye Institute (NEI) of the National Institutes of Health (NIH) is conducting clinical and genetic studies of X-Linked Juvenile<unk> . This study began in 2003 and as of 2018 is continuing to recruit patients. A better understanding of why and how<unk>  develops might lead to improved treatments. Males diagnosed with X-linked juvenile<unk>  and females who are suspected carriers may be eligible to participate. In addition to giving a medical history and submitting medical records, participants submit a blood sample and the NEI will perform a genetic analysis. There is no cost to participate in this study. Tractional<unk>  This may be present in conditions causing traction on the retina especially at the macula. This may occur in: a) The vitreomacular traction syndrome; b) Proliferative diabetic retinopathy with vitreoretinal traction; c) Atypical cases of impending macular hole. Exudative<unk> <unk>  involving the central part of the retina secondary to an optic disc pit was erroneously considered to be a serous retinal detachment until correctly described by Lincoff as<unk> . Significant visual loss may occur and following a period of observation for spontaneous resolution, treatment with temporal peripapillary laser photocoagulation followed by vitrectomy and gas injection followed by face-down positioning is very effective in treating this condition.
Retinoschisis
Tangier disease
Ocular albinism
Bayoud disease
Oculocutaneous albinism
Chondrodysplasia punctata
Ocular albinism type 1
Ophthalmia nodosa