What is choroideremia?
- Part of the eye
- Choroid & retina
- Group
- Inherited retinal conditions
- Vision functions involved
- Visual field, Light and glare, Night vision
- Main source
- Retina UK
Choroideremia affects the light-sensitive layer at the back of the eye and the tissues which support the retina. Males are usually affected more severely, but females with the gene change can have sight difficulties too.
Retina
The light-sensitive layer at the back of the eye.
Visual field
The whole area you can see, including the sides.
How choroideremia can affect day-to-day life
You may recognise some of these situations, or none of them. The point is to find help with the things you want to do.
Evening travel
Difficulty in low light can make an otherwise familiar journey harder after dark.
Discuss the journey with a rehabilitation service and ask about mobility skills or support suited to your needs.
Noticing the whole scene
If the area you can see narrows, you may see a sign ahead but miss something farther to the side.
Explain this difference to the people around you. Ask for a mobility assessment if your confidence or safety is affected.
Reading and hobbies later on
Fine-detail tasks may change if the centre of vision becomes affected. This does not happen on the same timetable for everyone.
Ask for updated low-vision advice when a task becomes harder, including magnification or technology which reads text aloud.
Changes you may notice
- Difficulty seeing at night can be an early sign.
- The visual field can narrow over time. Central vision can be affected later on.
Everyone is different. Symptoms on their own cannot identify a condition.
What to do about a new or sudden changeAssessment and care
Specialist examination and genetic assessment can clarify the diagnosis. Discuss low-vision care and research questions with your retinal team.
Inheritance
Choroideremia is X-linked. Females who carry a disease-causing variant can have symptoms too, sometimes significant ones, so do not assume a carrier is unaffected.
Diagnosis
The appearance of the retina and the family history help tell choroideremia apart from similar conditions. Genetic testing can confirm the cause.
Progression
Sight loss generally progresses, but the rate differs between individuals. A diagnosis alone cannot predict a personal timeline.
How vision is affected
When the light changes, sight needs time
A change in the light can bring several difficulties at once. Cones handle detail and colour in brighter light. Rods handle dim light. Cone-rod dystrophy often affects cones first, with rod difficulties developing later, and the balance differs from person to person. Slow adjustment and a lasting problem in dim light are two separate things. Extra time helps with one but does not remove the other.
Think of walking into a hallway from a sunny street, or leaving a dim cafe. The difficulty changes while you stand in the same spot. Tell your eye-care team about both directions: what is hard straight away, what gets easier with time, and what stays hard.
This is a designed teaching sequence, not a measured adaptation curve. A 15 or 60 second playback is a demonstration length, not a prediction of how long anyone takes to adjust. A washed-out screen cannot reproduce light sensitivity or pain. Nothing flashes, and the rest of the page stays unchanged.
Sources checked 5 October 2026: RNIB: inherited retinal conditions, MedlinePlus: cone-rod dystrophy, Macular Society: cone dystrophy.
These topics explain the parts of vision involved. They do not predict your sight, diagnose anything or show the condition itself.
Visual field
Finding a face and noticing the edge of a step make different demands on sight. One uses the centre of your view. The other uses the edges.
Open the visual field labLight and glare
Glare can be uncomfortable and can wash out detail. Where the light comes from matters as much as how much light there is.
Open the light and glare labNight vision
Rods work in dim light. Cones handle colour and fine detail in brighter light. Adjusting to darkness is a separate problem from discomfort in bright light.
Open the night vision labEveryday support
Ask about support for dim-light travel and mobility. Keep a record of changes and questions for your clinic.
A question to take to your appointment
Has the genetic cause been confirmed, and what should relatives know about assessment?Prepare your appointment checklist
Sources and review status
- Retina UK: Choroideremia
- Retina UK: inheritance patterns
- RNIB: low-vision services
- RNIB: useful home technology
Sources checked 4 October 2026. Educational draft, not yet clinically reviewed. No clinician has endorsed this page. Follow the advice of your own eye-care team.
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