Adult-onset foveomacular vitelliform dystrophy

What it is

From: Orphanet

A rare, genetic, macular dystrophy characterized by blurred vision, metamorphopsia and mild visual impairment secondary to a slightly elevated, yellow, egg yolk-like lesion located in the foveal or parafoveal region.

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.

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

Any abnormality of the eye, including location, spacing, and intraocular abnormalities.

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

Abnormality of eyesight (visual perception).

Visual impairment · Very frequent (99-80%)

Visual impairment (or vision impairment) is vision loss (of a person) to such a degree as to qualify as an additional support need through a significant limitation of visual capability resulting from either disease, trauma, or congenital or degenerative conditions that cannot be corrected by conventional means, such as refractive correction, medication, or surgery.

Vitelliform maculopathy · Very frequent (99-80%)

Egg yolk-like (vitelliform) maculopathy is a lesion caused by the accumulation of material, often lipofuscin, in the subretinal space underlying the macula. Lesions may be singular or multiple, and may be either sharply or poorly demarcated.

Choroideremia · Frequent (79-30%)

Well-defined, pale patches in the fundus.

Color vision defect · Frequent (79-30%)

An anomaly in the ability to discriminate between or recognize colors.

Iris hypopigmentation · Frequent (79-30%)

An abnormal reduction in the amount of pigmentation of the iris.

Visual field defect · Frequent (79-30%)

Retinal nonattachment · Occasional (29-5%)

Retinal nonattachment is a developmental (congenital) condition in which persistent fetal blood vessels appear to proliferate more dramatically during infancy, causing complete perinatal detachment of the retina. This may occur during or shortly after neurogenesis, since the pathology is apparent at birth, and it may have a tractional basis, involving fibrovascular strands between the retina, posterior lens and hyaloid vessels.

When it may begin

From: Orphanet

Adult

Inheritance in the source

From: Orphanet

Autosomal dominant; Not applicable

Which doctor should you see?

The suggested department for discussing Adult-onset foveomacular vitelliform dystrophy 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 Adult-onset foveomacular vitelliform dystrophy. 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.