Retinal Detachment

Retinal Detachment

Retina is the light sensitive inner layer of the eye where the images are formed and are later relayed to the brain. This is akin to the photographic film of a camera, and is very important for vision. Retinal detachment is a condition in which the Retina separates from the underlying layer and hence loses its functional capacity. A retinal detachment, leads to a sudden and severe loss of vision, and if not treated properly can cause blindness and shrinking and disfiguring of the eye.

Most commonly, retinal detachment occurs due to a hole/tear formation in the retina. Through this hole, liquefied vitreous, which is jelly like substance filling the eyeball, passes behind the retina and detaches it. Tractional retinal detachment usually occurs in diabetics or other vascular diseases of the retina. Extensive membranes are formed on the retina, which on contracting, pull the retina up.
Presence of high degrees of myopia (minus power), injury to the eye, occurrence of retinal detachment in the fellow eye, occurrence of retinal detachment in the blood relatives, cataract surgery etc. are some of the factors that increase the risk of retinal detachment.
If one has any of the above mentioned risk factors, he/she should get regular retinal checkups. The pupils are dilated and the retina, especially the peripheral part, is checked thoroughly with the help of Indirect Ophthalmoscope. In case a retinal break or lesion is discovered, it can be treated by a simple preventive procedure of Laser or Cryopexy.
Perception of Flashes of light, or sudden onset of Floaters are common symptoms which may point towards the presence of a Retinal Tear or Retinal Detachment. A loss of field of vision or sudden decrease in central vision are symptoms of Retinal Detachment. The diagnosis is confirmed by a detailed retinal checkup by a retinal specialist. In case of poor visibility, B-scan Ultrasound test may be required to confirm the diagnosis.
When the retina stays detached for a long time, it starts to shrink and membranes form on it. This not only requires a major surgery, it also decreases the chances of success. Moreover, as the retina stays detached longer, it does not get adequate blood supply and thus loses the vision potential. This limits the ultimate gain of vision even after a successful reattachment of the retina.
Post-operatively, the patient may be needed to be maintained in a special position to support the retina. This is especially required in cases of Vitreo-retinal surgeries. During the follow up visits, supplementary laser treatments may be advised. As it is a major surgery, some of the patients may also develop complications like glaucoma, cataract, infection, corneal opacity etc. due to the detachment or due to the treatment. The fellow eye is also at a risk for future retinal detachment and must be checked at regular intervals. Hence a regular follow up is very important.
The primary aim of the surgery is to re-attach the retina. The vision regained primarily depends upon the 'strength' of retina, which in turn depends upon many factors, especially the duration of detachment. The earlier the surgery is done, the better are the visual results. The vision regained may not be the same as that before the detachment occurred. But in case no surgery is done, the vision is likely to deteriorate further leading to blindness, shrinking and disfiguration of eyeball. Hence it is important to do the surgery as soon as possible.
In some patients re-detachment may occur due to formation of membranes on the retina (called Proliferative Vitreo Retinopathy). Also in 20-30% of patients operated for Vitreoretinal surgery, retinal detachment may recur after the removal of Silicone Oil. Hence the patients are required to maintain regular post-operative follow up for a long time even after the surgery.

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