Have you ever felt like you were seeing small black objects floating in front of your eyes? Or maybe your vision is a little blurry? These can be normal, but sometimes they can be a sign of a problem inside your eye. Today we're going to talk about one such rare eye condition that can be controlled if treated properly.
What is this (Birdshot Chorioretinopathy)?
Simply put, Birdshot Chorioretinopathy, or BSCR for short, is a rare inflammatory disease that occurs inside the eye. It is not a chronic condition, meaning it does not get better in a short period of time, but a persistent condition. If not treated properly, it can lead to permanent vision changes or even complete loss of vision .
(BSCR) is a serious condition that belongs to a group of diseases called ``Uveitis'', which damage the tissues inside the eye. It mainly involves swelling of:
- Retina : This is the light-sensitive membrane at the back of our eye. It's like the film in a camera. The images we see are recorded here.
- Choroid : This is located under the retina. This is the membrane that connects the retina to the white part of the eye, and supplies blood to the retina, that is, it nourishes it.
The most characteristic feature of this disease is the appearance of small, oval, cream-colored spots in the deep part of the retina and the upper layer of the choroid. Early symptoms often include black objects floating in front of the eyes (floaters) , blurred vision , or both. This condition usually affects both eyes .
Over time, this damage can lead to conditions such as cystoid macular edema or glaucoma . Although there is no cure, Birdshot Chorioretinopathy is a treatable disease . Early detection is essential for successful treatment.
Who gets Birdshot Chorioretinopathy?
Actually, this disease can develop in anyone. But it is most common in middle-aged, white adults between the ages of 40 and 60. It is very rare for children to develop this disease.
Are there other diseases similar to this (Birdshot Chorioretinopathy)?
Yes, several other diseases, including other diseases in the Uveitis group, can have similar symptoms to Birdshot Chorioretinopathy. Therefore, it is very important to get an accurate diagnosis so that you can receive appropriate treatment. Some of the diseases that can be similar to BSCR are:
- Lymphoma (a type of cancer)
- Sarcoidosis (a disease that causes small swellings in various parts of the body)
- `(Sympathetic ophthalmia)` (A rare type of uveitis caused by an eye injury)
- Syphilis (a sexually transmitted disease)
- `(Presumed ocular histoplasmosis syndrome (POHS))` (A condition affecting the eyes caused by a fungal infection)
- `(Tuberculosis)` (Tuberculosis)
- `(Vogt-Koyanagi-Harada syndrome)` (a disease that affects the nervous system, affecting vision and hearing)
There is also a group of inflammatory diseases called ``White dot syndromes'', which can also show symptoms of BSCR. These cause ``lesions'' to the retina and choroid. Some examples are:
- `(Acute posterior multifocal placoid pigment epitheliopathy (APMPPE))`
- `(Multifocal choroiditis and panuveitis (MCP))`
- `(Multiple evanescent white dot syndrome (MEWDS))`
- `(Punctate inner choroidopathy (PIC))`
Why is this called Birdshot Chorioretinopathy?
This is actually a relatively new disease, first described in 1949. It was not until 1980 that two ophthalmologists gave it the name "(Birdshot Chorioretinopathy)". The reason is that there are cream and orange oval spots scattered throughout the retina. The name comes from the fact that the pattern of these spots resembles the pattern of small bullets (birdshot) used to shoot birds. Imagine, there are spots inside the eye, like the bullets that are scattered when a gun is fired.
Are there other names for this?
Yes, there are several other names used for the disease (Birdshot Chorioretinopathy):
- `(Birdshot chorioretinitis)`
- `(Birdshot retinochoroiditis)`
- `(Birdshot retinochoroidopathy)`
- `(Birdshot uveitis)`
- `(BSCR)` (short name)
- `(Posterior uveitis)` (uveitis that occurs behind the eye)
- `(Vitiliginous choroiditis)`
How common is Birdshot Chorioretinopathy?
This is a very rare disease . Researchers believe that it affects less than one in a hundred thousand people. This means that even in Sri Lanka, there may be people with this disease, but the number is very small.
What causes Birdshot Chorioretinopathy?
Researchers still don't know the exact cause of the disease, but they suspect it's an autoimmune disease . Simply put, our body's own defense system, the immune system, mistakenly attacks our own healthy tissues.
More than 90% of people diagnosed with (BSCR) have an antibody gene (a molecule that stimulates the immune system) called `(HLA-A29)` in their body. This is something that is inherited from parents. However, `(HLA-A29)` is not necessary to develop (Birdshot Chorioretinopathy). Also, it is possible to have this antibody gene but not develop the disease.
What are the symptoms of Birdshot Chorioretinopathy?
The symptoms of this disease can vary from person to person. It is a progressive disease , meaning that symptoms can gradually worsen over a period of months to years.
The first symptoms of Birdshot Chorioretinopathy are often:
- Seeing black objects floating before the eyes (floaters)
- Blurred vision
This condition usually doesn't cause eye pain or redness . However, you may experience the following:
- Vision changes or decreased vision.
- Decreased peripheral vision or difficulty judging distance.
- High pressure in the eye (ocular hypertension).
- Night blindness (nyctalopia) (poor vision at night).
- Color vision problems (`(color blindness)`), difficulty distinguishing certain colors (`(dyschromatopsia)`.
- Sensitivity to bright light or glare (photophobia).
Some people may experience unusual vision changes or cognitive problems. For example:
- Ceiling fan effect : When you close your eyes, it appears as if a ceiling fan or windmill is spinning.
- Seeing flashes of light or glare (photopsia) or seeing distorted shapes (metamorphopsia) .
- Blurred, shiny vision, as if looking through water or dirty glass .
In severe cases, conditions such as cataracts or glaucoma can develop. These can cause severe vision loss even after treatment for the swelling. Birdshot Chorioretinopathy can also lead to problems in the central part of the retina, such as cystoid macular edema and epiretinal membranes.
How is Birdshot Chorioretinopathy diagnosed?
This disease can sometimes be a little difficult to diagnose because it is a rare disease and the distinctive spots may not be visible in the early stages of the disease.
Ophthalmologists often diagnose BSCR through an eye exam. They also do a blood test to check if you have the HLA-A29 antibody.
Doctors may use a variety of tests to monitor you over time. It's important to stay in touch with your doctor to get the care you need.
Is there a complete cure for Birdshot Chorioretinopathy?
Unfortunately, there is no complete cure for this disease. However, if the disease is diagnosed and treated early , symptoms can be reduced and the disease can be prevented from getting worse.
Remember: the most important thing is to diagnose the disease early and start treatment!
Who can be on my treatment team?
Your care team will recommend treatments, monitor you, and adjust your medications based on your condition and side effects. Your team may include:
- Ophthalmologist : The main doctor who deals with eyes.
- Nephrologist : Because some treatments affect the kidneys.
- Ocular immunologist: A doctor who has specialized training in problems of the immune system of the eye.
- Rheumatologist: A doctor who specializes in diseases related to inflammation in the body, because this is also a disease of inflammation.
- Orthopedist : Because some treatments affect the bones.
How is Birdshot Chorioretinopathy treated?
Treatment for this disease depends on the severity of your condition and how it changes over time. The main goal of treatment is to reduce swelling in your eyes and prevent or restore some of the vision that has been lost .
Doctors usually first prescribe high doses of corticosteroids (a type of steroid medication) to control eye swelling. Then, the dose is gradually reduced to minimize the risk of side effects. You can get steroids in the following ways:
- Eye drops
- Oral medicines
- A small device that is surgically implanted inside the eye (intravitreal implant)
- Injection
- Given into a vein (IV - intravenously)
Many people also need to take immunosuppressants long-term . These medications stop your immune system from attacking your eyes. One or more of the following may be used:
- `(Alkylating agents)`
- `(Antimetabolite drugs)`
- `(Biologic agents)` (biological drugs)
- `(T-cell transduction/calcineurin inhibitors)`
Can Birdshot Chorioretinopathy (Birdshot Chorioretinopathy) treatments cause side effects?
Yes, long-term use of steroids and immunosuppressants can cause serious side effects . For example, gastrointestinal problems (ulcers, ulcers) or bone problems (osteoporosis) can occur. These medications can also increase the risk of developing cataracts or glaucoma.
Your doctor will monitor you for any side effects and prescribe other medications if necessary. If you are taking oral steroids, your doctor will check you for bone loss (osteoporosis) and your risk of fractures.
Your doctor may also recommend a bone density scan . They may also prescribe medications (bisphosphonates) to prevent bone loss.
What kind of long-term monitoring do I need for (BSCR)?
Be aware of any changes or complications in your condition. Your doctor will do blood and urine tests to check how well your kidneys, liver, and bone marrow are working. You will also likely need regular eye exams, visual field tests, and optical coherence tomography (OCT) scans.
Can I reduce my risk of developing Birdshot Chorioretinopathy?
There is currently no known way to prevent this disease. In most cases, it is believed to be caused by a specific antibody gene (antigen) that is inherited from family members.
Regular eye exams can help detect early signs of disease, so you can get timely treatment if needed. Tell your doctor if anyone in your family has eye problems.
What is the outlook for Birdshot Chorioretinopathy?
The outlook for this disease varies from person to person . It depends on the severity of the condition and the success of treatment. In mild cases, treatment can help maintain or even improve vision.
When should I seek medical advice for (Birdshot Chorioretinopathy)?
It is essential to seek prompt diagnosis and treatment from an ophthalmologist for Birdshot Chorioretinopathy. Even if your vision seems fine, an eye exam can detect low-level swelling.
Tell your doctor about any side effects, changes in symptoms, or vision from your medication. You may be given another medication if needed. Your doctor will talk to you about the options that are best for you.
Final Take-Home Message
(Birdshot Chorioretinopathy) is a rare but treatable disease . So don't panic. The most important thing is to get your eyes checked regularly and follow your doctor's recommendations . Over time, your doctor will tell you how to protect your vision and prevent complications. Then you will be able to see the world clearly for much longer. Take care of your eyes, because they are very precious!
` Birdshot Chorioretinopathy, Eye Diseases, Vision Impairment, Uveitis, Retina, Autoimmune Diseases, Eye Treatment
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