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 Retinal detachment  

 

 


What is a retinal detachment?
A retinal detachment is a separation of the retina from its attachments to its underlying tissue within the eye. Most retinal detachments are a result of a retinal break, hole, or tear. These retinal breaks may occur when the vitreous gel pulls loose or separates from its attachment to the retina, usually in the peripheral parts of the retina. The vitreous is a clear gel that fills 2/3 of the inside of the eye and occupies the space in front of the retina. As the vitreous gel pulls loose, it will sometimes exert traction on the retina, and if the retina is weak, the retina will tear. Most retinal breaks are not a result of injury. Retinal tears are sometimes accompanied by bleeding if a retinal blood vessel is included in the tear.

Once the retina has torn, liquid from the vitreous gel can then pass through the tear and accumulate behind the retina. The build-up of fluid behind the retina is what separates (detaches) the retina from the back of the eye. As more of the liquid vitreous collects behind the retina, the extent of the retinal detachment can progress and involve the entire retina, leading to a total retinal detachment. A retinal detachment almost always affects only one eye. The second eye, however, must be checked thoroughly for any signs of predisposing factors that may lead to detachment in the future.


What are the results of surgery for a retinal detachment?
The surgical repair of retinal detachments is successful in about 80% of patients with a single procedure. With additional surgery, over 90% of retinas are reattached successfully. Several months may pass, however, before vision returns to its final level. The final outcome for vision depends on several factors. For example, if the macula was detached, central vision rarely will return to normal. Even if the macula was not detached, some vision may still be lost, although most will be regained. New holes, tears, or pulling may develop, leading to new retinal detachments. If a gas or air bubble was inserted in the eye during surgery, maintaining proper positioning of the head is also important in determining the final outcome. Close follow-up by an ophthalmologist, therefore, is required. Long-term studies have shown that even after preventive treatment of a retinal hole or tear, 5% to 9% of patients may develop new breaks in the retina, which could lead to a retinal detachment. Overall, however, repair of retinal detachments has made great strides in the past 20 years with the restoration of useful vision to many thousands of patients.


 


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