Vision with silicone oil inside your eye is blurry, shifted, and noticeably different from your normal sight. The oil is placed there to hold a damaged retina in position after surgery, and while it does that job well, it also acts as a lens of its own, pushing your prescription several diopters in one direction and making everything look soft or out of focus. Most people live with the oil for a few months before it is surgically removed, and during that window your visual world takes some getting used to.
How Silicone Oil Shifts Your Focus
Silicone oil has a different refractive index than the natural vitreous gel it replaces, so it bends light differently on its way to the retina. The direction and size of that shift depend on whether your eye still has its natural lens. If you still have your own lens (what surgeons call a “phakic” eye), the oil tends to make you more farsighted, often by about five to seven diopters. If your lens has already been removed (an “aphakic” eye), the oil actually brings your prescription closer to normal by reducing the extreme farsightedness that aphakic eyes usually have. In either case, the change can range from five to nine diopters and occasionally reaches as high as fourteen.
1PubMed. Refractive changes from use of silicone oil in vitreous surgeryThe shape of the oil bubble inside the eye and your head position also influence what you see. When you look down or tilt your head, the bubble shifts, and the optical effect changes slightly. One study noted that the resultant refraction depended on the shape of the silicone oil bubble and was influenced by the posture of the patient.
2Eye. Refractive changes in silicone filled eyesFor people who were very nearsighted before surgery, the oil can paradoxically bring their distance vision closer to balanced, since the hyperopic shift partially cancels out the existing myopia. For everyone else, though, the refractive change means your glasses or contacts from before surgery will no longer work. Most eye doctors will hold off on prescribing new lenses while the oil is in place, because everything will shift again once it comes out.
What You Will Actually See Day to Day
Beyond the raw prescription change, the quality of vision through silicone oil is different from what numbers alone suggest. The oil does not transmit light as cleanly as the natural vitreous. Many people describe a hazy, slightly washed-out view, and contrast sensitivity drops. Fine detail and reading can be difficult even with the best possible correction in place.
A study tracking patients with silicone oil found that the median best potential visual acuity while the oil was in place was around 20/40 when measured with specialized testing. That is roughly the level where you can read large print and navigate a room comfortably but struggle with small text and may not meet the driving standard in many places. Seven of the patients in that series lost at least three lines of vision on the eye chart while the oil remained inside the eye.
3PubMed Central. Vision loss associated with the use and removal of intraocular silicone oilIn practical terms, you should expect the oil-filled eye to be a helper rather than a leader. Your other eye, if healthy, will likely do most of the heavy lifting for reading, driving, and detail work. The oil-filled eye can still give you peripheral awareness and a sense of depth, but it will feel like looking through a foggy window compared to normal sight.
Face-Down Positioning After Surgery
One of the most challenging parts of having silicone oil is the positioning your surgeon may ask you to maintain afterward. Because silicone oil is lighter than water, it floats upward inside the eye. If the retinal damage is at the top of the eye, the oil naturally presses against it. But if the tear or detachment is lower, your surgeon may ask you to keep your head face-down so the floating oil bubble shifts to cover the problem area.
A survey of vitreoretinal surgeons found that roughly two-thirds advise face-down positioning whenever they use silicone oil, and that proportion climbs to about 79% for complicated retinal detachments. The recommended duration varies widely, from a single day to three weeks, with about half of surgeons recommending six to ten days.
4PubMed Central. Practice of postoperative face-down positioning and its duration after silicone oil tamponade in vitreoretinal surgery: Results of a surveyFace-down positioning is exhausting. You eat, sleep, and sit with your face angled toward the floor. Special pillows and face-down chairs exist to make it tolerable, but most people find the first few days miserable. If your surgeon prescribes it, the duration matters for your retina’s healing, so pushing through is worth it even when every muscle in your neck protests.
Pressure Buildup Inside the Eye
Elevated eye pressure is one of the most common problems after silicone oil placement. The oil can block the normal drainage pathways inside the eye, especially if it migrates forward into the space between the iris and the cornea. This pressure rise can happen early, within the first days or weeks, or develop gradually over months.
5PubMed Central. Risk Factors and Management of Intraocular Pressure Elevation After Vitrectomy Combined with Silicone Oil TamponadeThe mechanisms behind the pressure increase are varied. Early on, the oil itself can physically push the iris forward and block drainage, a situation called pupillary block. Later, chronic inflammation inside the eye can cause scar tissue to close off the drainage angle, and tiny emulsified oil droplets can clog the trabecular meshwork, which is the eye’s natural drain.
6Ophthalmology. Silicone Oil–induced Secondary GlaucomaYou will feel elevated pressure as a dull ache or a sense of fullness in the eye. If it spikes sharply, you may notice a sudden worsening of vision, nausea, or a headache on that side. Your surgeon will check your pressure at every follow-up visit and may prescribe drops to keep it in a safe range. In severe cases, a small opening in the iris (an iridectomy) can relieve a pupillary block, or the oil may need to come out sooner than originally planned.
7PubMed Central. Surgical Treatment in Silicone Oil-Associated GlaucomaCataract Formation
If you still have your natural lens when silicone oil goes in, expect that lens to cloud up. Cataract development is almost inevitable with prolonged oil contact. Research has shown that the oil triggers a process where lens cells undergo programmed death at an accelerated rate, driven by specific proteins that regulate cell survival.
8PubMed Central. Apoptosis Factors of Lens Epithelial Cells Responsible for Cataractogenesis in Vitrectomized Eyes with Silicone Oil TamponadeThe silver lining is that cataract surgery is routine and can be combined with silicone oil removal in a single procedure. In a study of patients who had combined oil removal and cataract surgery with lens implantation, about 37% of eyes achieved good vision (better than 6/18), and the rate of severe vision loss dropped from 47% before surgery to about 17% afterward. Around a third of those eyes did not even need glasses for distance after the combined procedure.
9PubMed Central. Visual Outcomes and Refractive Status after Combined Silicone Oil Removal/Cataract Surgery with Intraocular Lens ImplantationIf you are already pseudophakic (you had cataract surgery before and already have an artificial lens), the oil will not cause a new cataract, though it can deposit on the lens implant and cloud it over time.
When the Oil Starts Breaking Into Droplets
Over time, silicone oil does not stay as a single smooth bubble. It begins to emulsify, meaning it breaks into tiny droplets that scatter through the fluid inside the eye. These droplets look like small glistening spheres floating in your vision and can settle on structures throughout the eye.
What drives emulsification? Two things work together. First, proteins naturally present in the eye’s fluid act as surfactants, lowering the surface tension at the oil-water boundary and making it easier for droplets to form. Second, your eye movements provide the mechanical energy that physically shakes the oil apart. Higher mechanical energy from eye movements produces smaller, more stable droplets that do not recombine.
10PubMed Central. The Role of Eye Movements in the Process of Silicone Oil Emulsification After Vitreoretinal SurgeryEmulsification is one of the main reasons surgeons want to remove the oil rather than leave it indefinitely. The scattered droplets can clog the drainage system (contributing to glaucoma), deposit on the cornea, and cause ongoing inflammation. You cannot prevent emulsification by keeping your eye still, since normal involuntary eye movements are enough to drive the process once it starts. This is a clock that starts ticking the moment the oil goes in, and it is a major reason the oil is considered temporary.
How the Oil Holds Your Retina in Place
Understanding why the oil is there in the first place can help you tolerate its visual side effects. Silicone oil works by pressing against the retina through a combination of buoyancy (it floats upward inside the eye), the volume it occupies, and surface tension. Of these, surface tension is the critical factor. The oil forms a seal over retinal tears, preventing fluid from seeping underneath and lifting the retina off again.
11PubMed. The physical and surgical aspects of silicone oil in the vitreous cavityThis sealing action is why silicone oil is chosen for complicated cases. In a study comparing silicone oil to gas tamponade for giant retinal tears, final retinal reattachment was achieved in about 98% of eyes regardless of which tamponade was used. However, postoperative vision was better in the gas group, highlighting the optical cost of choosing oil.
12Dove Press. Comparison Between Silicone Oil and Gas in Tamponading Giant Retinal BreaksGas bubbles absorb on their own within weeks, but they require strict positioning and prevent air travel until they dissipate. Oil stays put, does not expand at altitude, and gives the surgeon a longer window to ensure healing. For retinas that have already failed one repair, or for detachments complicated by scar tissue, the longer tamponade time of oil can make the difference between keeping the retina attached and losing it.
When and How the Oil Comes Out
Silicone oil removal is a second surgery, typically performed three to six months after placement, though the timing is set on an individual basis depending on how the retina has healed and whether complications have developed.
13Malaysian Journal of Ophthalmology. Intraocular silicone oil removal: timing, outcome, and silicone oil complications encounteredIn one retrospective series, oil was removed anywhere from six weeks to twelve months after the initial surgery.
14PubMed Central. Timing and outcomes after silicone oil removal in proliferative vitreoretinopathy: a retrospective clinical seriesThe removal surgery itself is relatively quick. It is done through small incisions in the white of the eye, and the oil is aspirated out. Many surgeons replace the oil with saline or a short-acting gas bubble. If you also need cataract surgery, both procedures can often happen at the same time, which means one recovery period instead of two.
Once the oil is out, your refraction shifts again. A study of patients who had combined oil removal, cataract surgery, and lens implantation found that the roughly four-diopter hyperopic shift present while the oil was in place reversed into mild myopia after removal, landing close to the preoperative target.
15PubMed. Refractive status and visual acuity changes after oil removal in eyes following phacovitrectomy, intraocular lens implantation, and silicone oil tamponadeVision After Oil Removal
Removing the oil does not guarantee that your vision snaps back to what it was before the retinal problem started. The retina itself has been through serious trauma: detachment, surgery, tamponade, and sometimes repeated procedures. Even when the retina stays attached and the oil comes out cleanly, structural changes at the macula (the central vision area) can limit recovery. In one study, loss of the foveal depression, the tiny pit at the center of the macula responsible for sharp vision, was a consistent finding on imaging in patients who had lived with silicone oil.
3PubMed Central. Vision loss associated with the use and removal of intraocular silicone oilThat said, some patients do see modest improvements after the oil is out. The combined oil-removal-and-cataract-surgery data mentioned earlier showed that a meaningful fraction of eyes moved from the “legally blind” category to functional vision. The realistic expectation for most people is stabilization or mild improvement rather than a dramatic recovery, with the final outcome depending heavily on how much the retina was damaged before the oil ever went in.
Risk of the Retina Detaching Again
One of the biggest fears after oil removal is that the retina will peel off again. The evidence puts this risk at roughly 13 to 15%. A study with a mean follow-up of about 40 months found that 13.2% of eyes experienced recurrent retinal detachment after oil removal. Risk factors included giant retinal tears, high myopia, inadequate cleaning of the vitreous base during the original surgery, and bleeding in the first postoperative week.
16PubMed. Surgical outcomes and incidence of retinal redetachment in cases with complicated retinal detachment after silicone oil removal: univariate and multiple risk factors analysisA separate analysis found a redetachment rate of about 15%, with a history of previously failed surgery being the strongest predictor, roughly quadrupling the odds. Interestingly, whether the surgeon applied laser around the entire retinal periphery during oil removal or used an additional gas bubble at the time did not significantly change the redetachment rate. Eyes that had the oil removed very early, within three months, showed a trend toward higher redetachment, though this did not quite reach statistical significance.
17PubMed Central. Retinal redetachment after silicone oil removal: a risk factor analysisIf the retina does come off again, another surgery is possible, and the surgeon may place silicone oil a second time. Some eyes go through multiple rounds before achieving a stable result. In a small number of cases where the retina repeatedly fails to stay attached, the oil may be left in permanently as a long-term measure, with the understanding that the complications of indefinite oil tamponade must be managed ongoing.
Imaging Challenges While the Oil Is Inside
If your doctor orders retinal imaging while the oil is still in your eye, the pictures may look strange. Silicone oil’s high refractive index interferes with optical coherence tomography (OCT), the standard tool for examining retinal layers in fine detail. The oil causes signal loss, bright artificial bands, and truncation of deeper retinal structures. Newer swept-source OCT machines penetrate through the oil better than older spectral-domain devices, but artifacts still limit accurate measurement of macular thickness and detection of subtle pathology.
18PubMed Central. Artifact in swept source optical coherence tomography due to silicone oilThis means your surgeon may rely more heavily on clinical examination, ultrasound, and your subjective reports of visual changes while the oil is in place. Do not be alarmed if OCT scans look unusually unclear. It is the oil, not necessarily a worsening of your retinal condition.
Heavy Silicone Oil for Detachments at the Bottom of the Eye
Standard silicone oil floats, which makes it excellent for tamponading the upper part of the retina but less effective for breaks along the bottom. For inferior detachments, surgeons sometimes use “heavy” silicone oil, a denser formulation that sinks instead of floats. One such product, Densiron 68, has been shown to efficiently fill the lower retinal periphery and may reduce the risk of scar tissue developing in the lower quadrants after standard oil tamponade has already controlled the upper portions.
19PubMed Central. Densiron 68 heavy silicone oil in the management of inferior retinal detachment recurrence: analysis on functional and anatomical outcomes and complicationsThe visual experience with heavy oil is similar to standard oil in terms of blurriness and refractive shift, but positioning requirements may differ since the oil naturally sits at the bottom of the eye. Your surgeon will explain which type you are getting and what that means for your recovery posture.
What Researchers Are Working On Next
Silicone oil has been the workhorse of long-term retinal tamponade for about half a century, and researchers have been trying to find something better for much of that time.
20PubMed. Silicone oil in vitreoretinal surgery: indications, complications, new developments and alternative long-term tamponade agentsThe most promising direction involves hydrogel-based vitreous substitutes, materials with high water content and tunable mechanical properties that could mimic the natural vitreous gel more closely than oil does. Because they are water-based, they would not cause the same refractive distortion or emulsification problems.
21PubMed Central. Hydrogel-Based Vitreous SubstitutesThese hydrogels remain investigational, however, and none has replaced silicone oil in routine clinical practice.
22PubMed Central. Physics-informed, phenotype-based endotamponade selection in vitreoretinal surgery: current agents and emerging vitreous substitutesFor now, silicone oil remains the tool your surgeon reaches for when the retina needs long-term support, and the visual trade-offs described here are a known cost of keeping that retina in place while it heals.