X-linked juvenile retinoschisis

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

X-linked juvenile retinoschisis is a condition characterized by impaired vision that begins in childhood and occurs almost exclusively in males. This disorder affects the retina, which is a specialized light-sensitive tissue that lines the back of the eye. Damage to the retina impairs the sharpness of vision (visual acuity) in both eyes. Typically, X-linked juvenile retinoschisis affects cells in the central area of the retina called the macula. The macula is responsible for sharp central vision, which is needed for detailed tasks such as reading, driving, and recognizing faces. X-linked juvenile retinoschisis is one type of a broader disorder called macular degeneration, which disrupts the normal functioning of the macula. Occasionally, side (peripheral) vision is affected in people with X-linked juvenile retinoschisis.

X-linked juvenile retinoschisis is usually diagnosed when affected boys start school and poor vision and difficulty with reading become apparent. In more severe cases, eye squinting and involuntary movement of the eyes (nystagmus) begin in infancy. Other early features of X-linked juvenile retinoschisis include eyes that do not look in the same direction (strabismus) and farsightedness (hyperopia). Visual acuity often declines in childhood and adolescence but then stabilizes throughout adulthood until a significant decline in visual acuity typically occurs in a man's fifties or sixties. Sometimes, severe complications develop, such as separation of the retinal layers (retinal detachment) or leakage of blood vessels in the retina (vitreous hemorrhage). These eye abnormalities can further impair vision or cause blindness.

ORPHANET DEFINITION A rare disorder involving multiple structure of the eye characterized by reduced visual acuity in males due to juvenile macular degeneration. Clinical features such as vitreous hemorrhage, retinal detachment, and neovascular glaucoma can be observed in advanced stages.

Inheritance

From: MedlinePlus Genetics, National Library of Medicine

X-linked recessive

Frequency in the source

From: MedlinePlus Genetics, National Library of Medicine

Point prevalence: 1-9 / 100 000; Worldwide; Value and class. Point prevalence: 1-9 / 100 000; France; Value and class. Point prevalence: 1-9 / 100 000; Europe; Value and class.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Abnormal electroretinogram · Very frequent (99-80%)

Any abnormality of the electrical responses of various cell types in the retina as measured by electroretinography.

Abnormality of eye movement · Very frequent (99-80%)

An abnormality in voluntary or involuntary eye movements or their control.

Abnormality of vision · Very frequent (99-80%)

Abnormality of eyesight (visual perception).

Glaucoma · Very frequent (99-80%)

Glaucoma refers loss of retinal ganglion cells in a characteristic pattern of optic neuropathy usually associated with increased intraocular pressure.

Progressive visual loss · Very frequent (99-80%)

A reduction of previously attained ability to see.

Retinoschisis · Very frequent (99-80%)

Splitting of the neuroretinal layers of the retina.

Abnormal foveal morphology · Frequent (79-30%)

An abnormality of the fovea centralis, the central area of the macula that mediates central, high resolution vision and contains the largest concentration of cone cells in the retina.

Electronegative electroretinogram · Frequent (79-30%)

A dark-adapted bright flash electroretinogram in which the b-wave that is of markedly lower amplitude than the associated a-wave.

Hyperautofluorescent retinal lesion · Frequent (79-30%)

Increased amount of autofluorescence in the retina as ascertained by fundus autofluorescence imaging.

Retinal pigment epithelial atrophy · Frequent (79-30%)

A nonspecific term denoting wasting, especially as a result of degeneration, of the retinal pigment epithelium (RPE).

Vitreous hemorrhage · Frequent (79-30%)

Bleeding within the vitreous compartment of the eye.

Absent foveal reflex · Occasional (29-5%)

Absent reflectivity of the fovea, which normally is a bright pinpoint of light that is observed to move sideways or up and down in response to movement of the opthalmoscope.

Mizuo phenomenon · Occasional (29-5%)

Change in the color of the fundus from red in the dark-adapted state to golden immediately or shortly after the onset of the light. The color of the fundus reflex in the light adapted state has also been described as golden-yellow, gray-white, and yellow-white. This reflex can appear either homogeneous or in streaks in the fundus. The retinal vessels appear to be protruding in contrast to the radiant background. Dark adaptation leads to disappearance of the unusual fundus coloration [Digital Journal of Ophthalmology 2008; Volume 14, Number 14].

Nyctalopia · Occasional (29-5%)

Inability to see well at night or in poor light.

Other findings in the same source

From: Orphanet

Additional reported features include Retinal detachment (Occasional (29-5%)); Strabismus (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: MedlinePlus Genetics, National Library of Medicine

Adolescent; Adult; Childhood; Infancy

Inheritance in the source

From: MedlinePlus Genetics, National Library of Medicine

X-linked recessive

Frequency and the population described

From: MedlinePlus Genetics, National Library of Medicine

Point prevalence: 1-9 / 100 000; Worldwide; Value and class. Point prevalence: 1-9 / 100 000; France; Value and class. Point prevalence: 1-9 / 100 000; Europe; Value and class.

Understanding the inheritance label

From: MedlinePlus Genetics

An X-linked recessive pattern involves a gene on the X chromosome. The number of X chromosomes and the particular genetic change influence how a condition is expressed. A genetic counsellor should interpret the result and the family history before discussing risks for relatives or future pregnancies.

Which doctor should you see?

The suggested department for discussing X-linked juvenile retinoschisis is Ophthalmology, with a ophthalmologist as the relevant type of clinician. Ophthalmologist; paediatric services for children as appropriate.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which part of the eye or visual pathway is affected?
• What change in vision requires immediate contact with the eye service?
• What are the aims and alternatives of any proposed eye treatment?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for X-linked juvenile retinoschisis. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.