The use of silicone oil is a legitimate treatment- part of a well recognised procedure, obtainable through the NHS or privately, that can be used to repair a detached retina.The operation itself is called a Vitrectomy,in the situation where they are re-attaching a retina, the vitreous jelly within the eye is either partially or totally removed, and a gas or silicone oil bubble introduced into the vitreous. This bubble sits against the retina, helping it to re-attach smoothly (tamponade). You will have to spend a significant proportion of each day with your head down for several weeks, to allow the bubble to exert gentle pressure against the back of the eye and to hold the retina in place - this is called "posturing"
Post-operatively,if gas is used, the gas bubble gradually dissipates over time, and your vision will improve with that dissipation. With Silicone oil, vision is blurred/blocked for anything up to 3 months, at which time another procedure is usually required to remove the silicone oil.
It is difficult to comment about blurring/distortion that you might experience, because that will depend on the extent of any damage to the retina, any scarring that might be there.It will gradually improve, and your eyesight will adapt to some extent.
The best person to ask about post op recovery and implications for your eyesight going forward is someone from your eye specialists team.
The link Woofgang offered to the Moorfields Hospital explanation is very good, and well worth a read.
http://www.retinaeyed...etinal-detachments-2/