Cone dystrophy

Title

Categories:

Congenital and Genetic Diseases; Eye diseases

Summary Summary

Cone dystrophy is a general term for a group of rare eye disorders that affect the cone cells of the retina. Cone cells allow a person to see color and fine detail, and they work best in bright light. The cone dystrophies can cause a variety of symptoms such as decreased visual clarity when looking straight ahead, a reduced ability to see colors, and an increased sensitivity to light.^[1] There are two main subtypes of cone dystrophy, called stationary cone dystrophy and progressive cone dystrophy. The age when symptoms begin, the type and severity of symptoms, and the progression of symptoms are all very different between individuals, even between people with the same type of cone dystrophy.^[1] Mutations in many genes have been found to cause cone dystrophy, and the condition can be inherited in an autosomal dominant, autosomal recessive, or x-linked manner.^[2]

Last updated: 7/1/2013

Symptoms Symptoms

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms	Other Names	Learn More: HPO ID
80%-99% of people have these symptoms
Abnormal electroretinogram		0000512
Abnormality of color vision	Abnormal color vision	0000551
Abnormality of retinal pigmentation		0007703
Photophobia	Extreme sensitivity of the eyes to light Light hypersensitivity [ more ]	0000613
Visual impairment	Impaired vision Loss of eyesight Poor vision [ more ]	0000505

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Last updated: 6/1/2018

Diagnosis Diagnosis

The diagnosis of cone dystrophy is made based upon the presence of characteristic symptoms, a detailed family history, a thorough clinical evaluation and a number of supporting tests. While exams that measure visual acuity, perception of color, and field of vision are used to arrive at a proper diagnosis, an electroretinogram (ERG) is used to confirm the diagnosis.^[3]^[4]

During an ERG, eye drops are used to numb the eye before a special contact lens recorder is placed on the eye. Then a series of flashes of light are used to stimulate the retina. Doctors can then measure the electrical response of the rods and cones to the light. The test is performed twice – once in bright room and again in a dark room. A weak of absent signal of cone cells indicates cone dystrophy.^[3]^[4] More details about the diagnosis of cone dystrophy can be accessed through the University of Michigan Kellogg Eye Center.

Last updated: 9/2/2014

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Organizations Organizations

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

American Foundation for the Blind
1401 South Clark Street
Suite 730
Arlington, VA 22202
Toll-free: 800-232-5463
Telephone: 212-502-7600
Fax: 888-545-8331
E-mail: http://www.afb.org/sendMail.asp
Website: http://www.afb.org/
Foundation Fighting Blindness
7168 Columbia Gateway Drive, Suite 100
Columbia, MD 21046
Toll-free: 800-683-5555
Telephone: 410-423-0600 (local)
TTY: 800-683-5551
E-mail: info@fightblindness.org
Website: http://www.blindness.org
Retina International
Ausstellungsstr. 36
8005 Zurich
Switzerland
Telephone: + 41 (0)44 444 10 77
E-mail: info@retina-international.org
Website: http://www.retina-international.org

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Learn More Learn More

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

The National Organization of Rare Diseases (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.

In-Depth Information

The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
PubMed is a searchable database of medical literature and lists journal articles that discuss Cone dystrophy. Click on the link to view a sample search on this topic.

Related Diseases Related Diseases

The following diseases are related to Cone dystrophy. If you have a question about any of these diseases, you can contact GARD.

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References References

Heckenlively J. Cone Dystrophy. NORD. 2010; https://rarediseases.org/rare-diseases/cone-dystrophy/.
Simunovic, M.P., Moore, A.T. The cone dystrophies. Royal College of Ophthalmologists. 1998; http://www.nature.com/eye/journal/v12/n3b/pdf/eye1998145a.pdf. Accessed 6/19/2013.
Heckenlively J. Cone Dystrophy. National Organization for Rare Disorders (NORD). 2010; http://www.rarediseases.org/rare-disease-information/rare-diseases/byID/847/viewAbstract. Accessed 9/2/2014.
Openshaw A, Branham K, Heckenlively J. Understanding Cone Dystrophy. University of Michigan Kellogg Eye Center. February 2008; http://www.kellogg.umich.edu/patientcare/downloads/Understand-Cone-Dystrophy.pdf. Accessed 9/2/2014.