If vitrectomy is performed before the PVR cycle is complete, retinal re-detachment is virtually assured.51 Conversely, early surgery with sili-cone oil implantation is usually able to keep at least the macula attached and prevent, in most cases, the development of a closed funnel.

• Presence of silicone oil tamponade. Silicone oil slows down the progression of the retinal detachment and makes reoperation less urgent.

• Condition of the macula. If the macula is on (and especially if there is silicone oil in the eye), the intervention can be deferred virtually indefinite^2. If the macula is off or the retinal detachment is rapidly threatening it, surgery should not be delayed.

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