Optical Coherence Tomography of the Retina (OCT)
The modern ophthalmology uses widely the OCT method for eyes – optical coherence tomography of the retina.
Optical coherence tomography of the retina is the unique modern non-invasive, non-contact, highly accurate and informative method for diagnosis of retinal diseases, mainly the state of its central area - the macula. The OCT of eyes offers the possibility to get the image of optical cross sections of the retina using a scanning laser beam, to detect early disorders of anatomic and functional status of the retina and to measure objectively the extent of these changes. The main point of the OCT of eyes is to measure the delay time of the light beam reflected from the examined tissue. Since modern equipment does not enable direct measurement of this parameter on so small sections, the OCT work is based on the light interferometry principles.
Optical coherence tomography of the retina (OCT) can be used for all diseases of the central region of the retina and has several advantages: possibility of application at any age, definition of a specific layer-by-layer structure of the retina, clear visualization of retinal changes in different types of pathologies, definition of the smallest structural changes at any stage of the process, an indispensable method for dynamic monitoring and assessment of the efficiency of retinal diseases treatment.
Three-dimensional OCT of eyes (3D OCT-1000) is more modern. Three-dimensional visualization of the area of the retina or other objects is obtained by using a specialized software program based on the linear scan. That kind of image gives an opportunity to the ophthalmologist to assess the surface profile of the studied structure, its internal topography. It is possible to see distinct borders of paraplasms and to observe their dynamics.
3D-imaging makes it possible, simultaneously with scanning of the retina, to photograph the fundus and with higher accuracy to compare visible changes and deep ones brought to light by scanning.
Groups of patients requiring optical coherence tomography of the retina:
- children and teenagers with amblyopia;
- women over 50 in order to detect the early stage of age-related macular degeneration of the retina;
- patients with glaucoma;
- patients suffering from diabetes;
- patients with intraocular lens with visual acuity below 0.1 (to detect the early stage of macular edema of the retina);
- patients with dystrophic disorders of the retina and choroid, with eye-lesion produced by insolation etc.