EXAMINATION
Message of common value
THE OCT DEVIDE CAN MAKE A SECTION THROUGH THE RETINA IN A FEW SECONDS WITHOUT INJECTING A COLORING AGENT
NORMAL SECTION THROUGH THE RETINA WITH THE TYPICAL THINNING AT THE MACULA
HERE, YOU SEE MORE DENSE EN LESS DENSE NUCLEI LAYERS OF THE RETINA
SMALL DISRUPTIONS (red arrows) AT THE PIGMENTEPITHELIUM LEVEL : DRUSEN
THE RETIAL PIGMENTEPITHELIUM SEPARATED FROM THE UNDERLYING CHOROID, FORMING A SEMICIRCULAR BLACK DOME
THE DISRUPTIONS IN THE PIGMENTEPITELIAL LAYER (blue arrow) ALLOW FLUID TO LEAK INTO THE RETINAL LAYERS (yellow arrow)
ABNORMAL IMAGE: SWELLING OF THE RETINA THROUGH ACCUMALATION OF MOIST (= black area) UNDER THE RETINA
HERE THE PHOTORECEPTORS ARE DESTROYED: THINNER RETINA (red arrows) AND LIGHT PASSES INTO THE CHOROID (yellow arrows)
A FIBROUS LAYER (red arrow) FORMS ALONG THE INTERNAL LIMITING MEMBRANE OF THE RETINA: GIVES WRINKLING OF THE RETINA AND FLUID ZONES UNDER THE MEMBRANE ( black zones)
THE EPIRETINAL MEMBRANE (red arrow) SHRINKS AND THIS TEARS THE RETINA HORIZONTALLY. THE PHOTORECEPTOR LAYER (blue arrow) STAYS INTACT
MACULAR HOLE (because of vitreous traction)
THE AGING VITREOUS REMAINS ATTACHED TO THE RETINA (red arrow) AND HAS PULLED THE RETINA AWAY FROM THE CHOROID, WITH SEPARATION OF THE LAYERS OF THE RETINA (yellow arrows)
BLACK FLUID CYSTS IN THE RETINA BY LEAKAGE (because of diabetes or trombosis)
SEROSA CENTRALIS: BY STRESS A TEMPORARY RETINAL DETACHMENT IS CAUSED BY FLUID LEAK (red arrow)
WHAT IS AN OCT?
This is a scan of research that makes a three-dimensional cross section of the eye, somewhat similar to the CT examination in radiology. However, there is only light to pass and no harmful X-rays. You should also be pupil is not dilated.
UTILITY OF OCT?
The 3-dimensional cross section shows the cause and severity of macular disease and allows the evolution of post-treatment to follow, much better and much less invasive than other tests can.
WHAT IS THE STUDY?
You just need a few minutes to sit device (such as a computer-eye test). You should try your eye as wide as possible to keep open, which sometimes can be difficult. Unlike a fluografie you do not pupil-dilating drops. There is no injection required.
THE RESEARCH IS IMPORTANT TO OCT TO PREVENT BLINDNESS
* Suffering from macular
WHAT IS THE MACULA?
The macula is the central zone of the retina (the membrane lies against the inside of the eyeball). This central zone provides the sharp vision, you need to read and recognize objects. The side of the retina is only used to see motion and coarse contours. The macula is also the "eye in the eye". The center of the macula is called "the fovea" and provides the sharpest vision!
MACULA, HOW CAN THIS BE AFFECTED?
The damage done
By age-related deterioration (= "AMD" = age-related macular degeneration)
DRY DEGENERATION, namely thickening (drusen) and dilutions (Pigment Epithelial atrophy) - evolves slowly (several years required) to a central spot disturbing
WET: by ingrowth of blood vessels - is evolving rapidly (within several months) to a dense central black spot. The wet degeneration is worse.
LEAKAGE PHENOMENA (with diabetes or thrombosis (blockage of blood =)
BY TRACTION PHENOMENA: vitreous membranes can the central part of the macula shrink ("pucker") or broken threads (macular hole)
GLAUCOMA
WHAT IS GLAUCOMA
You feel nothing, and yet it is blinding eye by high eye pressure. (Normally the pressure between 10 to 20 mm Hg).
CAUSE
This condition is usually due to a (family), poor drainage of the fluid inside the eye (at the corner of the front room), rarely to large production. This allows the eye pressure to rise. High eye pressure has nothing to do with high blood pressure. Sometimes an eye pressure of less than 20 mm Hg also cause problems. This usually occurs in people with bad blood: vein calcification by diabetes or hypertension / reactive blood vessels: cold hands and feet / Migraine
CONSEQUENCE
Too high eye pressure pushes the blood vessels of the optic nerve close so slowly (over 10 years), but the optic nerve fibers die (starting with the outermost). Accordingly, there is a dimple in the optic nerve and visual field will shrink. Given the vision of it is little used, the patient noted only late that something is wrong. Thus, the disease usually in an advanced stage and unfortunately nothing can be done to improve visibility. Part of the optic nerve is indeed dead and this is irreversible (a new optic nerve can not be implanted!). Only if it is established early glaucoma may increase, thanks to treatment, the IOP below 20 mm Hg reduced the optic nerve and does not (further) die (blindness can give!)
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