What is Retinitis pigmentosa

Retinitis pigmentosa is a group of rare, genetic eye disorders that cause the progressive breakdown of cells in the retina, leading to significant vision loss. It primarily affects the light-sensing photoreceptor cells, typically resulting in night blindness followed by a gradual narrowing of the peripheral visual field.

What exactly is Retinitis pigmentosa?

Retinitis pigmentosa (RP) is a degenerative eye condition characterized by the slow loss of photoreceptor cells—the rods and cones—located in the retina at the back of the eye. While the name suggests an inflammatory process ("-itis"), the condition is primarily a dystrophy, meaning it is a progressive deterioration of tissue. In the DiseaseMaps community, 707 people with Retinitis pigmentosa have shared their experiences, highlighting the diverse ways this condition impacts daily life, from navigating low-light environments to managing changes in central vision over time.

How does Retinitis pigmentosa affect the body?

The primary impact of Retinitis pigmentosa is on the visual system. Rod cells, which are responsible for peripheral and night vision, are usually the first to degenerate. As these cells die, patients experience "tunnel vision," where the central vision remains clear while the outer field of view disappears. In later stages, the cone cells, which manage color perception and fine detail, also begin to fail, which can eventually lead to legal blindness. While primarily an ocular condition, some rarer forms of Retinitis pigmentosa are syndromic, meaning they may be associated with hearing loss, such as in Usher syndrome.

What causes this condition and who is affected?

Retinitis pigmentosa is caused by mutations in any of over 80 different genes involved in the structure or function of the retina. These mutations disrupt the life cycle of photoreceptor cells, causing them to die prematurely. The condition is estimated to affect approximately 1 in 3,000 to 4,000 people worldwide. It can be inherited in several ways:

• Autosomal Recessive: The most common form, where both parents carry the gene.


• Autosomal Dominant: Only one parent needs to carry the gene mutation.


• X-linked: Typically affects males more severely, as the gene is located on the X chromosome.

Symptoms often begin in adolescence or early adulthood, though the age of onset and the rate of progression vary widely even within the same family.

How is Retinitis pigmentosa different from other eye diseases?

Unlike macular degeneration, which primarily affects central vision early on, Retinitis pigmentosa typically begins with the loss of peripheral vision and difficulty seeing in dim light. Furthermore, the presence of characteristic "bone-spicule" pigment deposits on the retina, visible during a dilated eye exam, helps clinicians distinguish Retinitis pigmentosa from other retinal dystrophies.

Next steps

• Schedule a comprehensive examination with a retinal specialist or an ophthalmologist who specializes in inherited retinal diseases.


• Request genetic testing to identify the specific gene mutation, which is essential for understanding your prognosis and potential eligibility for future gene therapies.


• Connect with the 707 members of the DiseaseMaps community to share experiences and coping strategies for managing vision changes.


• Consult a low-vision rehabilitation specialist to explore tools and technologies that can help maximize your remaining vision.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Retinitis Pigmentosa.


• Orphanet: Retinitis Pigmentosa (ORPHA:791).


• OMIM (Online Mendelian Inheritance in Man): Retinitis Pigmentosa overview.


• Foundation Fighting Blindness: Understanding Retinal Degenerative Diseases.