Have you ever wondered how amazingly our eyes work? The eye is a very complex and valuable organ. So today we are going to talk about a little-known, but very important part of the eye. That is the choroid. You may not have heard this name before. But that's okay, today we will talk about it simply, in a way that you can understand.
What is the choroid? What service does it provide to the eye?
Simply put, the choroid is the middle layer of your eyeball, the outer wall of your eyeball. It belongs to the uvea. To be precise, the choroid is one of the main blood vessels that supply our eyes. It also helps control the amount of light that enters the eye. So, the choroid is very important in how we see the world.
The choroid has two main functions:
1. Supplying the eye with the necessary blood.
2. Absorption of light entering the eye.
Now let's talk about these two in a little more detail .
1. Blood supply to the eye
This is the main function of the choroid. In particular, it is this one that supplies blood to the retina and the optic nerve in our eyes. Imagine, this retina and the optic nerve are constantly sending signals to the brain. It's like two machines that work non-stop. So, these two parts need a larger amount of blood and nutrients than the other tissues of the eye. The choroid has a lot of blood vessels, like a tangle. This is why it can provide exactly the necessary amount of blood.
2. Light absorption
The other important function of the choroid is to absorb light. This is not something that is very obvious, but it is very important.
Did you know that the choroid contains a pigment called melanin in greater amounts than any other tissue in our eyes? This same melanin is also found in our skin. It is this melanin that absorbs harmful ultraviolet rays from the sun and protects our skin from things like skin cancer. Melanin can absorb not only ultraviolet rays, but almost all visible light.
Melanin in the eye acts like acoustic foam, which is used to absorb sound. You may have seen this kind of foam on the walls of recording studios. It stops the sound from bouncing around and echoing. In the same way, melanin in the eye stops light from scattering inside the eye. This prevents the photoreceptor cells in our retina from being damaged by unnecessary light. This is very important for clear vision.
Where is the choroid located? How does it look?
The choroid is located in the back two-thirds of our eyeball. To be precise, it is located under the white outer wall of the eye (which we call the sclera) and above the retina, which is the light-detecting layer at the back of the eye. The thickness of the choroid can vary from 0.1 millimeters (mm) to about 0.22 mm. That is, about the thickness of a regular printer paper.
As for the appearance of the choroid, it is a place full of blood vessels . Also, it is dark in color due to the melanin it contains. The amazing thing is that, just like our skin, the choroid can have birthmarks or normal spots (called nevi). These are not visible to us from the outside. Most people only find out they have them when an ophthalmologist examines their eyes.
What conditions can affect the choroid?
Unfortunately, there are a number of diseases that can affect the choroid. This can be caused by a variety of things, from circulatory system diseases to inflammatory diseases. Here are a few examples:
- Albinism : A lack of melanin pigment can cause vision problems and sensitivity to light.
- Congenital (born at birth) conditions : For example, diseases such as choroideremia can damage the retina.
- Diabetes-related retinopathy .
- Choroidal neovascularization and macular degeneration (especially its wet form).
- Eye cancers : especially intraocular melanoma.
- Eye ischemia : This is a decrease in blood flow to the eye. For example, an eye stroke.
- Glaucoma causes damage to the optic nerve and retina .
- Eye injuries .
- Inflammatory diseases : Conditions such as uveitis or chorioretinitis.
If there is a problem with the choroid, what symptoms can occur?
If you have a condition involving the choroid, you may experience certain symptoms. These include:
- Dark spots in vision (Scotomas) or visual field defects.
- Blurred vision .
- Double vision (Diplopia).
- Eye pain.
- Headaches.
- Sensitivity to light (blue eyes) (Photophobia)
- Low vision.
If you experience these symptoms, see a doctor immediately!
There are some symptoms that indicate a more serious or urgent condition . In such cases, it is essential to seek medical advice immediately.
These are the symptoms that require urgent attention:
* Nausea and vomiting with eye pain/pressure.
* Seeing rainbow-colored rings around light.
* Sudden loss of vision in any way .
* Sudden flashes of light before the eyes (Photopsias).
If you feel something like this, please see a doctor without delay .
What tests are available to detect problems with the choroid?
When you go for a routine eye exam, an ophthalmologist can see changes in the choroid through the thin layers of the retina, or understand the condition of the choroid through changes in the retina itself. In addition, there are several special tests that can help examine the choroid and diagnose diseases related to it. They are:
- Visual acuity test : This is a test to see how clearly you can see.
- Visual field and depth perception tests.
- Slit lamp exam : Examination of the eye with a special microscope.
Because of the circulatory connection between the choroid and the retina, some tests that examine the retina can also help determine the condition of the choroid. For example:
- Fluorescein angiography
- Indocyanine green angiography
- Optical Coherence Tomography (OCT)
These tests can help your doctor gain a better understanding of the condition of your eyes.
What are the treatments for diseases that affect the choroid?
In most cases, there is little treatment that directly affects the choroid. Instead, the underlying condition that is affecting the choroid is treated . So, treatment methods can vary greatly depending on the condition. Here are a few examples:
- Treatment for Albinism : Since albinism is a genetic disease, it cannot be treated directly. Treatment is aimed at reducing the symptoms.
- Anti-glaucoma medications : These reduce the pressure in the front of the eye and prevent damage to the structures on and around the choroid.
- Anti-inflammatory drugs : These drugs reduce inflammation. They can be given systemically or specifically to the eye.
- Anti-vascular endothelial growth factor (VEGF) drugs : These anti-VEGF drugs prevent the formation of new blood vessels.
- Cancer treatments : Like other types of cancer, eye cancer may require treatments such as surgery, chemotherapy, and radiation therapy.
- Medications that help/improve blood circulation : This includes many things, such as blood thinners (anticoagulants) and medications that control blood pressure.
- Eye surgeries : Some conditions that affect the choroid require surgery to correct them.
Depending on your underlying condition, other treatments may be suggested. Your ophthalmologist or other healthcare provider can tell you more about these treatments and help you choose the one that is best for you.
What can we do to keep our choroid healthy?
There are several things you can do to keep your eyes healthy, including the health of your choroid. The most important of these is to get regular eye exams . This applies to everyone, not just those who wear glasses.
In addition, other things you can do are:
- Wear eye protection . When you are doing any work, wear safety glasses or goggles specifically designed for that work. This is especially important when working with dust or chemicals.
- Avoid nicotine use . Smoking, vaping, and chewing tobacco can all affect your circulatory system, which can also damage your eyes.
- Manage chronic conditions . If you have a condition that can affect your eyes and/or circulatory system, such as diabetes or high blood pressure, managing that condition well can help prevent or delay further damage to your eyes.
- Take care of your health overall . Maintaining a healthy weight and getting proper nutrition are both important for maintaining the best possible eye health.
Finally, things to remember
Okay, so I hope you now have a better understanding of the choroid we talked about today.
Remember, your retina is what detects light and converts it into visual signals that are sent to your brain. To do this, the retina needs a constant, large blood supply. So, your choroid is the main blood supply to your retina and optic nerve. The choroid also helps manage the light that enters your eyes. This makes it easier for the retina to process that light properly.
The choroid may not be as well-known as other parts of the eye. But it is an essential and very important part of our vision . In your daily life, there are many things you can do to take care of the health of your choroid - and your eyes as a whole. So, it's good to think about taking care of your eyes, right?
` Choroid, eye health, retina, optic nerve, melanin, eye diseases, eye tests
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