Short answer · Medically reviewed summary · Last updated: 2026-05-08
Choroideremia is a rare, X-linked genetic disorder that primarily causes progressive vision loss, starting with night blindness followed by a narrowing of the visual field. If you suspect you have Choroideremia, you should seek an evaluation from an ophthalmologist or a retinal specialist to conduct specific diagnostic imaging and genetic testing. What are the early signs of Choroideremia? The hallmark of Choroideremia is nyctalopia, or night blindness, which often begins in childhood or adolescence.
How do I know if I have Choroideremia?
Could you have Choroideremia? Early signs that prompted real patients to seek diagnosis, plus medically reviewed guidance.
Choroideremia is a rare, X-linked genetic disorder that primarily causes progressive vision loss, starting with night blindness followed by a narrowing of the visual field. If you suspect you have Choroideremia, you should seek an evaluation from an ophthalmologist or a retinal specialist to conduct specific diagnostic imaging and genetic testing.
What are the early signs of Choroideremia?
The hallmark of Choroideremia is nyctalopia, or night blindness, which often begins in childhood or adolescence. As the condition progresses, individuals experience a gradual loss of peripheral vision, often described as "tunnel vision." Unlike normal age-related vision changes, these symptoms are progressive and typically affect both eyes. If you notice persistent difficulty navigating in low-light environments or a sense that your side vision is shrinking, it is important to document these changes.
How is Choroideremia diagnosed?
Because Choroideremia is an X-linked condition, it primarily affects males, though female carriers may show mild findings. Diagnosis involves a specialized retinal exam and genetic confirmation. You should ask your doctor about the following tests:
- Fundus Examination: Allows the doctor to visualize the characteristic patchy loss of the retinal pigment epithelium and choroid.
- Electroretinography (ERG): Measures the electrical response of your light-sensitive cells.
- Genetic Testing: This is the gold standard, identifying mutations in the CHM gene located on the X chromosome.
- Visual Field Testing: Used to map the extent of peripheral vision loss over time.
When should I see a doctor?
If you experience any sudden onset of flashes of light, a shower of "floaters," or a curtain-like shadow over your vision, seek urgent medical evaluation as these may indicate a retinal detachment, which can occur in Choroideremia. If your concerns are dismissed, advocate for yourself by requesting a referral to a retinal specialist or a neuro-ophthalmologist, and mention that you are concerned about a potential hereditary retinal dystrophy.
Next steps
- Schedule an appointment with a board-certified ophthalmologist specializing in retinal diseases.
- Join the 96 members at DiseaseMaps.org who are living with Choroideremia to share experiences and find support.
- Prepare a family health history to share with your clinician, noting any male relatives with similar vision loss.
Medical disclaimer: This information is for educational purposes only and does not substitute professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Choroideremia
- Orphanet: Choroideremia (ORPHA:167)
- OMIM (Online Mendelian Inheritance in Man): Choroideremia (#303100)
- Choroideremia Research Foundation (curechm.org)
