Advice after your nerve block for surgery
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Introduction
Fluorescein angiography is a method of investigating the retina, the light sensitive inner lining of the eyeball and which is equivalent to the film in a non-digital camera.
It is a clinical test to look at blood circulation inside the back of the eye, aids in the diagnosis of retinal conditions associated with diabetes, age related macular degeneration and other eye abnormalities. The test can also help follow the course of a disease and monitor its treatment. It may be repeated on multiple occasions with no harm to the eye or body.
The method of testing
Fluorescein, a harmless orange-red dye, is injected into a vein in the arm. The dye travels through the body to the blood vessels in the retina, the light sensitive nerve layer at the back of the eye. A special camera with a green filter flashes a blue light into the eye and takes multiple digital images of the retina. No X-rays are involved.
If there are abnormal blood vessels, the dye leaks into the retina or stains the blood vessels. Damage to the lining of the retina or atypical new blood vessels may be revealed as well. These abnormalities are determined through a careful interpretation of the photographs by an ophthalmologist.
Preparation
The nurse will ask about your general health, particularly any chest problems or allergies you may have. Please tell us if you have any health problems or have been unwell following previous injections of any type.
In order to carry out this assessment, it is necessary to use eye drops which enlarge the pupil (the black part in the centre of the eye). These drops will dilate your pupils and blur your vision for 4 - 6 hours and, therefore, it is advisable that you do not drive yourself afterwards.
You will be reviewed by the doctor after the fluorescein angiography to discuss the results.
Side effects and risks
- The dye can discolour skin and urine for approximately 24 hours until it is removed from the body by the kidneys. Increasing the amount of fluids helps this process.
- There is little risk in having fluorescein angiography, though some people may have mild allergic reactions to the dye. Severe allergic reactions have been reported, but very rarely.
- Being allergic to X-ray dyes with iodine does not mean you will be allergic to fluorescein.
- Occasionally, some of the dye leaks out of the vein at the injection site causing a slight burning sensation that usually goes away quickly.
Contact us
If you have any queries relating to this information, please contact the Ophthalmology service.
About this information
Service:
Ophthalmology
Reference:
QQ/033
Approval date:
5 August 2024
Review date:
1 July 2027
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Important note
This page provides general information only. It is developed by clinical staff and is reviewed regularly every 3 years for accuracy. For personal advice about your health, or if you have any concerns, please speak to your doctor.