Stargardt Disease
An inherited cause of central vision loss
Quick Facts
- Type: Inherited retinal (eye) disorder
- Affects: The macula, center of the retina
- Onset: Usually childhood or adolescence
- Main effect: Loss of central vision
Overview
Stargardt disease is the most common inherited form of macular degeneration. It affects the macula, the small central part of the retina at the back of the eye that is responsible for sharp, detailed, straight-ahead vision. Over time, light-sensing cells in the macula are damaged, causing the central vision to blur and fade.
Symptoms usually begin in childhood or the teenage years, though they can start later. The disease is progressive, meaning vision tends to worsen gradually. Peripheral (side) vision is usually preserved, so most people do not become completely blind, but the loss of central vision can make reading, recognizing faces, and detailed tasks difficult. There is currently no cure, but supportive care and low-vision aids help people live well.
Symptoms
Symptoms often develop slowly and may include:
- Gradual blurring or loss of central vision in both eyes
- Difficulty reading or seeing fine detail
- Gray, black, or hazy spots in the center of vision
- Trouble recognizing faces
- Slow adjustment of vision when moving between bright and dim light
- In some people, problems with color vision as the disease advances
Because side vision usually stays intact, people can still move around independently, but tasks that rely on sharp central vision become harder over time.
Causes
Stargardt disease is caused by changes (mutations) in a gene, most often a gene called ABCA4, that is needed for clearing away a fatty byproduct produced when the eye processes light. When the gene does not work properly, this byproduct, called lipofuscin, builds up in and damages the cells of the macula.
The condition is usually inherited in a recessive pattern, meaning a child develops it when they inherit a non-working copy of the gene from each parent. Parents who each carry one copy typically have normal vision themselves. Less commonly, other genes and inheritance patterns are involved.
Risk Factors
- Having two parents who each carry a Stargardt-related gene change
- A family history of Stargardt disease or early vision loss
- Being a sibling of someone with the condition, which raises the chance of carrying the gene
Stargardt disease is not caused by diet, eye strain, screen use, or lifestyle; it is determined by inherited genes.
Diagnosis
An eye specialist diagnoses Stargardt disease using a combination of eye examinations and imaging:
- Eye exam: Examining the retina, which may show yellowish flecks in the macula.
- Retinal imaging: Detailed scans such as optical coherence tomography (OCT) and autofluorescence imaging show changes in the macula and the buildup of lipofuscin.
- Vision and color testing: Measuring central vision and color perception.
- Electroretinography: A test of how the retina responds to light.
- Genetic testing: Confirms the diagnosis and identifies the gene involved, which can help with counseling.
Treatment
There is currently no cure for Stargardt disease, but several measures help protect remaining vision and support daily life:
- Eye protection: Wearing sunglasses that block ultraviolet and bright light, since strong light may worsen damage.
- Low-vision aids: Magnifiers, screen-reading software, large-print materials, and other tools to make the most of remaining vision.
- Avoiding high-dose vitamin A: People with Stargardt disease are usually advised not to take large vitamin A supplements, which may speed the buildup of harmful byproducts.
- Support services: Vision rehabilitation, occupational therapy, and counseling to help with school, work, and independence.
Research into gene therapy and other treatments is ongoing, and some people may be eligible for clinical trials.
Prevention
Because Stargardt disease is inherited, it cannot be prevented. However, some steps may help protect remaining vision and support families:
- Protect the eyes from bright sunlight with UV-blocking sunglasses
- Avoid high-dose vitamin A supplements unless advised by a specialist
- Do not smoke, as smoking is harmful to the retina
- Consider genetic counseling if Stargardt disease runs in your family
When to See a Doctor
See an eye specialist if you or your child notices gradual blurring or loss of central vision, difficulty reading, trouble recognizing faces, or dark or hazy spots in the center of vision. Early evaluation allows the cause to be identified and support to begin.
If there is a family history of Stargardt disease, regular eye examinations and genetic counseling can help with early detection and planning.
Frequently Asked Questions
What is Stargardt disease?
Stargardt disease is the most common inherited form of macular degeneration. It damages the macula, the central part of the retina, causing gradual loss of sharp central vision, usually starting in childhood or the teenage years. Side vision is generally preserved.
Does Stargardt disease cause total blindness?
It rarely causes complete blindness. Stargardt disease mainly affects central vision, so reading and recognizing faces become difficult, but peripheral vision usually remains. Most people retain enough side vision to move around independently.
Is Stargardt disease inherited?
Yes. It is caused by inherited gene changes, most often in the ABCA4 gene, and is usually passed down in a recessive pattern. A child typically develops it after inheriting a non-working gene copy from each parent, who are often unaffected carriers.
Can Stargardt disease be treated?
There is no cure yet, but care focuses on protecting remaining vision and supporting daily life with sunglasses, low-vision aids, and vision rehabilitation. People are usually advised to avoid high-dose vitamin A. Research into gene therapy is ongoing.
Why should people with Stargardt disease avoid high-dose vitamin A?
In Stargardt disease, a vitamin A byproduct builds up and damages the macula. High-dose vitamin A supplements may speed this buildup, so specialists usually advise against them. Always discuss supplements with your eye doctor.
References
- National Eye Institute (NEI). Stargardt Disease.
- MedlinePlus, U.S. National Library of Medicine. Stargardt macular degeneration.
- American Academy of Ophthalmology. Stargardt Disease.
- Genetic and Rare Diseases Information Center (GARD).