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News » Posterior vitreous detachment: causes, symptoms and those most at risk
Posterior vitreous detachment: causes, symptoms and those most at risk
The posterior vitreous detachment (its acronym DPV) is the consequence of the separation of the vitreous from the retina. The vitreous body is a gelatinous substance that adheres to the center of the eye to the retina that covers two-thirds volume of the eye and consists of about 99% water.
The rest is represented by molecules and structural cells: sugars, vitreous cells, collagen fibers, hyaluronic acid, proteins, electrolytes. All this is contained in the hyaloid membrane and occupies, therefore, a role of primary importance in the vitreous volume, in fact, any reduction can lead to detachment of the hyaloid membrane from the retinal surface.
How and when to place the rear vitreous detachment?
The posterior vitreous detachment takes place in four phases:
• The initially vitreous tends to melt and form small water gaps;
• In the next step these water gaps widen gradually;
• Then the water creeps into the vitreous and retina thus starting the rear vitreous detachment;
• The vitreous finally falls off completely from the retina.
In order to conditions that can determine the pathology in question, there is to say that the gap, in some cases, is to be considered as a normal physiological phenomenon, caused by the general dehydration same organism, especially after the age of forty.
Since then the phenomenon linked to the physiological process of aging, its incidence tends to increase with age.
The numbers bear this out: the posterior vitreous detachment strikes, in 27% of cases, individuals between 60 and 69 years to reach about 63% of subjects over 70 years.
Cases and conditions of greater risk
For short-sighted, the risk of posterior vitreous detachment is greater, in particular in cases of high myopia. This disease, in fact, tends to present even in advance of several years than non-myopic.
It seems likely, though not statistically proven, that the DPV appear more in the summer months when the body loses more fluid running into greater dehydration.
Other causes that may facilitate the occurrence of posterior vitreous detachment are the eye inflammation, uveitis and surgical procedures such as cataract.
The detachment, however, can also occur following traumas and accidents such as, for example, strong blows to the head.
Complications and treatment
The posterior vitreous detachment, when it does not involve traction on the retinal surface, is generally benign. If, instead, this tends to pull the retina, complications can arise.
Typically, we realize traction when it is accompanied by flashes of light (phosphenes) similar to the flash of the camera.
In these cases, you should avoid intense physical exercise and go to the eye doctor promptly.
Even the vision of flies can be a further signal of the posterior vitreous detachment possible: in this case, it is caused by the aggregations of cells floating within the vitreous body.
Unfortunately, a therapy that completely solves the trouble does not exist.
It must say that, fortunately, the rear detachment of the vitreous tends to regress spontaneously. With the passage of time, in fact, shadows appear, in general, more and more faded and you go to always perceive less because the brain tends, with time, to "ignore".