We all know how valuable your eyes are. So, sometimes you need to do special tests to know exactly if there are any problems with your eyes or if a certain disease is developing. One such important test is called Fluorescein Angiography. Although the name may sound a little strange when you hear it, this is actually a very important test for eye health.
What is Fluorescein Angiography?
Simply put, this is a test that takes pictures of the retina , the thin layer inside your eye that helps us see things. Think of it like a camera. The retina is what captures light and sends it to the brain to create the image we see.
In this test, your eye specialist will first dilate your pupil with eye drops. Then, a special dye called fluorescein is slowly injected into a vein in your arm. The dye travels through the blood vessels in your eye and makes them appear bright and clear. It's like a car headlight on a dark road, or a flashlight shining through a dark room. The doctor can then look at the condition of these blood vessels, their shape, and whether there are any blockages or leaks, to see if there are any conditions that could be affecting your vision.
Why is this test done? What can be found?
Your eye doctor uses this fluorescein angiography test to diagnose various eye diseases that affect the blood vessels in the retina or to monitor the progress of an existing disease. Here are some of these conditions:
- Age-related macular degeneration: This is a condition that usually causes vision loss in people over the age of 50, and may be hereditary. The macula is the central part of our retina that is very important for clear, sharp vision, reading, and recognizing faces.
- Cystoid macular edema: This is a condition in which fluid builds up in the central part of the retina (macula) and swells. This can cause blurred vision.
- Diabetes-related retinopathy: Over time, people with diabetes can develop damage to the blood vessels in their eyes. This can lead to complete loss of vision. Therefore, it is important for people with diabetes to have their eyes checked regularly.
- Macular hole: A small hole in the central part of the retina (macula) can cause vision changes.
- Macular pucker: A thin layer of tissue on the surface of the retina that can cause puckering and distorted vision.
- Ocular melanoma: This is a rare type of cancer that occurs inside the eye.
- Retinal detachment: This is a separation of the retina from its supporting tissues. This is an emergency and needs to be treated quickly.
- Retinitis pigmentosa: This is not a single disease, but a group of inherited eye diseases. This can cause various vision problems, such as poor night vision and reduced color vision.
You see how important this test is.
Who is doing this test?
This fluorescein angiography test is performed by a doctor who specializes in eye diseases. We call them an ophthalmologist . They are the ones who know the most about eye diseases and are trained to perform these specialized tests.
How should we prepare before the test?
Okay, now let's say you have to take this test. Before that, there are a few things you need to know and prepare for.
- Prepare for transportation: This is very important. Your vision may be blurred for several hours, possibly up to 12 hours, due to the dilation of the pupils during the test. Therefore, you may not be able to drive home on your own. It is wise to either bring someone with you or arrange for a taxi in advance.
- Tell your doctor about your medications: You should tell your eye doctor in advance about all the medications you are taking (prescribed by a doctor, over-the-counter medications, vitamins, even herbal remedies). Your doctor may ask you to temporarily stop taking some medications a few days before the test.
- Tell your doctor about your allergies: If you have any allergies, especially to iodine , be sure to tell your doctor. This is important because you may have an allergic reaction to the dye used in this test.
- Pregnancy: If you are pregnant, or think you may be pregnant, you should also tell your doctor. This is because doctors do not yet know exactly how this fluorescein angiography test will affect the unborn baby.
What happens during the test?
Okay, now let's see what exactly happens during the test. This is usually done in your doctor's office or at an eye clinic.
1. If you wear contact lenses, you must remove them before the test.
2. First, the doctor or nurse will put some eye drops in your eye. This causes the black part of the eye, called the pupil, to dilate (widen). This allows you to see better inside your eye. The eye may feel a little sore when you put these drops in, but this will go away after a while.
3. Next, you will be seated in front of a special camera. Your forehead and chin will be placed against the camera's points and you will be asked to remain still, just like you would during an eye exam.
4. Then, the camera takes the first set of pictures of your eye. This is done before the dye is injected.
5. Now the fluorescein dye mentioned earlier is slowly injected into a vein in your arm. When this is injected, you may feel a little like a little ant biting you, or you may feel a little numbness, but it won't be very painful.
6. As the dye travels through the blood vessels inside the eye, another set of pictures are taken. The dye makes the blood vessels more visible, so the doctor can identify any problems with them. At this time, you will be asked to stare at one spot for a long time, and may be asked to turn on a light and look at it.
This fluorescein angiography test is very quick, usually completed in less than 30 minutes .
What will happen after the test? What do we need to know?
You can go home the same day after the test. Most people don't feel any discomfort during the test. However, you should take a few precautions for a few hours after the test.
- Increased sensitivity to light: After the test, your eyes may be very sensitive to light. It's like your eyes turning blue when you go outside on a sunny day. So, it's a good idea to wear sunglasses until this sensitivity goes away. When you get home, closing the curtains and turning down the lights can help.
- Blurred vision: Your vision may be slightly blurred for a few hours due to the medication (dilating the pupils). That's why we've said before, bring someone home or arrange a ride. You may not be able to go to work that day, as you'll have to wait for your eyes to adjust. This blurriness usually subsides in about 4-6 hours, and can last for up to 12 hours.
Are there any risks to this test?
For most people, fluorescein angiography is not a serious risk. However, very rarely, some people may have an allergic reaction to the fluorescein dye used in the procedure. If this happens, you may experience hives or itching.
Also, some people may be sensitive to the dye called fluorescein. These may include:
- Feeling dizzy.
- Dry mouth.
- Increased heart rate.
- A metallic taste in the mouth. However, this usually goes away within a few minutes.
- Nausea or vomiting is okay.
- Sneezing.
If you experience these symptoms, tell the medical staff about them.
What are the possible side effects?
Side effects are common, meaning they are somewhat common. But these are not serious and will get better after a while.
- If the dye leaks out of the vein during the injection, you may feel a slight burning sensation on your skin. This will go away in a few minutes, and the dye will not harm your skin.
- For a few minutes, vision may appear dark or tinted, or appear to be a different color.
- Yellowing of the skin: Your skin may appear slightly yellow for a few hours after the test.
- Urine color change: Your urine may appear dark yellow or orange for about 24 hours. This is because the fluorescein dye is being excreted from the body with the urine. Just like when we eat beets, our urine turns red, or when we take certain vitamins, our urine turns yellow. This is normal and nothing to worry about.
What do you need to know about the test results?
Your ophthalmologist will discuss the results with you within a few days of the test. You may be able to get a rough idea of the results that day. If the test shows any blockages or leaks in the blood vessels inside your eye, it could be a sign of a condition such as diabetes-related retinopathy or macular degeneration . Your doctor can then do further tests to make an accurate diagnosis and decide on the best treatment for you.
When do you need to go to the Emergency Room?
Even though this doesn't happen very often, it's good to be aware of it.
Important: Although rare, a severe allergic reaction to the fluorescein dye can cause symptoms such as difficulty breathing, chest tightness, swelling of the throat, or swelling of the face, or a life-threatening condition called anaphylaxis . If you have any serious symptoms such as difficulty breathing, call 911 immediately or go to the nearest emergency room.
If you experience general allergy symptoms (e.g., hives, unbearable itching), call your doctor.
Is this a painful test?
Fluorescein Angiography may cause some uncomfortable side effects (e.g., a slight burning sensation when the medicine is applied to the eyes, a slight stinging sensation when the injection is given). However, this is not usually a painful test . If you experience any unbearable pain during the test, tell your doctor or staff immediately.
In summary... (Take-Home Message)
Okay, so to summarize what we've talked about, Fluorescein Angiography is a very important test that is done to check the condition of your retina , especially the health of the blood vessels there. In this, a special dye called fluorescein is used to clearly see the blood vessels inside the eye.
Eye specialists use this test to diagnose various eye diseases, such as diabetes-related retinopathy , age-related macular degeneration , or to monitor the progress of an existing disease. Although this is generally a safe test, keep in mind that some side effects may occur, such as blurred vision, sensitivity to light, and changes in the color of the skin and urine.
So, if your doctor tells you to have this Fluorescein Angiography test, don't be afraid of it, keep these facts in mind, and if you need to know anything else, ask the doctor and have everything explained. These types of tests are very important to protect your eyes!
` Fluorescein Angiography, Eye Examination, Retina, Eye Diseases, Diabetic Retinopathy, Macular Degeneration
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