Fundus Fluorescence Angiography (FAGD)
Fluorescence angiography is a diagnostic study similar to retinography, in which, using a special camera, pictures of the fundus-sensitive tissues are taken.
As the name indicates, a special colorant called soda fluorescein is used to carry out this study, which is administered to the patient by injection to achieve fundus circulation. The next step is to stimulate blood circulation to mix blood with a staining substance, which produces light transmission and allows you to capture the circulation of the vessels of the retina and choroid.
Angiography can detect abnormal phenomena in blood vessels, defects in the structures of their walls, the appearance of new vessels and the initial stage of retinal detachment.
In ophthalmology, as one of the most intensively developing areas of medicine, methods for diagnosing diseases are constantly being improved. This is facilitated by a huge leap forward in the development of technology related to the creation of illustrations. Achievements in this area not only allow for accurate timely diagnosis, but also take a fresh look at the pathogenesis of many diseases. An example of such a technique is fundus fundus fluorescence angiography (FAGD).
The term "fluorescence" is understood to mean the ability of solid, liquid or gaseous matter to emit absorbed energy in the form of electromagnetic radiation on waves of a similar or greater length. In fluorescence angiography, a special substance with similar properties (sodium fluorescein) is administered intravenously. After a short period of time, this substance reaches the vessels of the retina and choroid (choroid of the eyeball) through the bloodstream. At the same time, dye normally does not penetrate into the surrounding tissue outside the vessels (in the absence of a vascular wall defect). The substance begins to fluoresce at the moment when the source of exciting light is turned on: the stimulating light penetrates the eye through a barrier filter and the particles of the substance in the vessels begin to emit the energy of this light in the form of electromagnetic radiation, that is, to fluoresce.
Indications for fluorescence angiography (FAGD) can be considered such pathological conditions as:
- Diabetic retinopathy;
- Central serous choriopathy;
- Violations of patency in the basins of the vessels of the retina, ocular ischemic syndrome;
- Diseases of the optic nerve (diagnosis of optic neuropathies, drusen disk, congestive nipples of the optic nerve disc, etc.);
- Age-related macular degeneration;
- Hereditary retinal lesions;
- Fundus and iris neoplasms;
- Inflammatory diseases of the posterior pole of the eye.
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