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Retinal Detachment

 

Retinal detachment
Retinal detachment is a disorder of the eye in which the retina peels away from its underlying layer of support tissue. Fresh retinal detachment is a medical emergency.
Types
•    Rhegmatogenous retinal detachment – A rhegmatogenous retinal detachment occurs due to a break in the retina that allows fluid to pass from the vitreous space into the subretinal space between the sensory retina and the retinal pigment epithelium. Retinal breaks are divided into three types - holes, tears and dialyses. Holes form due to retinal atrophy especially within an area of lattice degeneration. Tears are due to vitreoretinal traction. Dialyses which are very peripheral and circumferential may be either tractional or atrophic, the atrophic form most often occurring as idiopathic dialysis of the young.
•    Exudative, serous, or secondary retinal detachment – An exudative retinal detachment occurs due to inflammation, injury or vascular abnormalities that results in fluid accumulating underneath the retina without the presence of a hole, tear, or break
•    Tractional retinal detachment – A tractional retinal detachment occurs when fibrous or fibrovascular tissue, caused by an injury, inflammation or neovascularization, pulls the sensory retina from the retinal pigment epithelium.
Risk factors:
•    Detachment is more frequent in the middle-aged or elderly population .
•    Retinal detachment is more common in those with high myopia (above 5–6 diopters), as their eyes are longer and the retina is stretched thin.
•    Blunt trauma
•    Retinal detachment can occur more frequently after surgery for cataract.
•    Tractional retinal detachments can also occur in patients with proliferative diabetic retinopathy or those with proliferative retinopathy of disease.In proliferative retinopathy, abnormal blood vessels (neovascularization) grow within the retina and extend into the vitreous. In advanced disease, the vessels can pull the retina away from the back wall of the eye causing a traction retinal detachment.
A retinal detachment is commonly preceded by a posterior vitreous detachment which gives rise to these symptoms:
•    flashes of light (photopsia) – very brief in the extreme peripheral (outside of center) part of vision
•    a sudden dramatic increase in the number of floaters
•    a ring of floaters or hairs just to the temporal side of the central vision
•    a slight feeling of heaviness in the eye
Although most posterior vitreous detachments do not progress to retinal detachments, those that do produce the following symptoms:
•    a dense shadow that starts in the peripheral vision and slowly progresses towards the central vision
•    the impression that a veil or curtain was drawn over the field of vision
•    straight lines (scale, edge of the wall, road, etc.) that suddenly appear curved (positive amsler grid test)
•    central visual loss
Treatment of Rhegmatogenous Retinal Detachment
There are several methods of treating a detached retina, each of which depends on finding and closing the breaks that have formed in the retina. All three of the procedures follow the same three general principles:
1.    Find all retinal breaks
2.    Seal all retinal breaks
3.    Relieve present (and future) vitreoretinal traction
1.    Cryopexy and Laser Photocoagulation:
cryotherapy(freezing) or laser photocoagulation are occasionally used alone to wall off a small area of retinal detachment so that the detachment does not spread.

2.    Scleral buckle surgery
Scleral buckle surgery is an established treatment in which the eye surgeon sews one or more silicone bands (bands, tyres) to the sclera (the white outer coat of the eyeball). The bands push the wall of the eye inward against the retinal hole, closing the break or reducing fluid flow through it and reducing the effect of vitreous traction thereby allowing the retina to re-attach. Cryotherapy (freezing) is applied around retinal breaks prior to placing the buckle. Often subretinal fluid is drained as part of the buckling procedure.

3.    Pneumatic retinopexy
This operation is generally performed in the doctor's office under local anesthesia. It is another method of repairing a retinal detachment in which a gas bubble (SF6 or C3F8 gas) is injected into the eye after which laser or freezing treatment is applied to the retinal hole. The patient's head is then positioned so that the bubble rests against the retinal hole. Patients may have to keep their heads tilted for several days to keep the gas bubble in contact with the retinal hole. This procedure is usually combined with cryopexy or laser photocoagulation.

4.    Vitrectomy :vitrectomy is an increasingly used treatment for retinal detachment. It involves the removal of the vitreous gel and is usually combined with filling the eye with either a gas bubble ( SF6or C3 F8gas) or silicon oil. Advantages of using gas in this operation is that there is no myopic shift after the operation and gas is absorbed within a few weeks. Silicon oil (PDMS), if filled needs to be removed after a period of 2–8 months depending on surgeon's preference. Silicon oil is more commonly used in cases associated with proliferative vitreo-retinopathy (PVR). A disadvantage is that a vitrectomy always leads to more rapid progression of a cataract in the operated eye. In many places vitrectomy is the most commonly performed operation for the treatment of retinal detachment.
 















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