# Agents for Vitreous Tamponade

Select air, expansile gas, or silicone oil after pars plana vitrectomy by matching tamponade duration, break location, proliferative vitreoretinopathy risk, postoperative positioning feasibility, and need for air travel or repeat surgery.

**Clinical question:** How should vitreoretinal surgeons select air, gas, or silicone oil tamponade after repair of retinal detachment?

Updated: 2026-09-15T22:24:55.657739+00:00

## What matters in practice
- Choose tamponade after retinopexy according to the required duration of break coverage, break location, proliferative vitreoretinopathy severity, and the patient's ability to maintain postoperative positioning. [15][16]
- For complete gas-fluid exchange, typical nonexpansile concentrations are SF6 20% and C3F8 14%; air resorbs in 5–7 days, SF6 in about 2 weeks, and C3F8 in about 8 weeks. [2][16]
- Gas provides substantially greater surface-tension force and buoyancy than silicone oil but requires positioning and creates perioperative anesthesia and travel constraints while present. [2][10][16]
- Silicone oil provides long-term tamponade, permits fundus visualization, and can reduce dependence on prolonged prone positioning, but requires later surgical removal and carries risks of emulsification, ocular hypertension, cataract, corneal complications, and unexplained visual loss. [5][7][19]
- In severe proliferative vitreoretinopathy, C3F8 and silicone oil had similar retinal reattachment, visual, and complication outcomes in the Silicone Study; C3F8 performed better than SF6 for reattachment in PVR grade C3. [12]

## Select tamponade by durability, break geometry, and postoperative constraints

Use tamponade after retinopexy to prevent recurrent subretinal fluid passage while chorioretinal adhesion forms.

At the end of pars plana vitrectomy, first determine whether short-term coverage is adequate or whether the eye requires weeks of internal support. Air, SF6, and C3F8 are temporary agents; silicone oil remains intraocular until surgically removed. The selection should reflect break location, retinal-detachment complexity, anticipated postoperative positioning, and patient-specific feasibility rather than duration alone. [15][16]

For uncomplicated rhegmatogenous retinal detachment treated with vitrectomy, gas and silicone oil have comparable primary reattachment rates, whereas gas tamponade has better functional outcomes in comparative evidence. This supports gas when durable tamponade is needed but no compelling anatomic or practical reason favors oil. Interpret this comparison cautiously because the meta-analysis found no randomized trials and selection bias is likely in observational comparisons. [23]

Buoyancy makes standard gas and light silicone oil most effective at the superior retina. Gas has greater buoyancy and approximately 30-fold greater tamponade tension than silicone oil, but its effect is temporary. Silicone oil may be favored when long-term support is required, when the patient cannot sustain prescribed postoperative positioning, or when ongoing fundus examination through a clear medium is important. [2][7][16]
- Use air when a short tamponade interval is sufficient; after complete gas-fluid exchange, intraocular air generally resorbs in 5–7 days. [2][16]
- Use nonexpansile SF6 when approximately 2 weeks of tamponade is appropriate; a commonly used concentration is 20%. [2][16]
- Use nonexpansile C3F8 when a longer tamponade interval is needed; a commonly used concentration is 14%, with resorption at about 8 weeks after complete gas-fluid exchange. [2][16]
- Use silicone oil when the case requires long-term internal tamponade or when gas-related positioning constraints are impractical; plan a separate removal procedure once the retina is sufficiently stable. [5][7][16]

*Practical comparison of commonly used postoperative tamponades after complete gas-fluid exchange. [2][15][16]*

| Agent | Typical concentration or status | Approximate intraocular duration | Selection advantage | Important limitation |
| --- | --- | --- | --- | --- |
| Air | Nonexpansile [15][16] | 5–7 days [2][16] | Shortest temporary tamponade option when low PVR risk permits. [2] | Short duration may be insufficient when prolonged support is required. [2][15] |
| SF6 | 20% nonexpansile [2][16] | About 2 weeks [2][16] | Intermediate-duration gas tamponade. [2][16] | Gas expansion and persistence require positioning and avoidance of nitrous oxide while the bubble remains. [10][16] |
| C3F8 | 14% nonexpansile [2][16] | About 8 weeks [2][16] | Longest commonly used gas duration; in severe PVR, C3F8 was more effective than SF6 for retinal reattachment during the first year. [12] | Longest gas-related functional restrictions and prolonged visual obstruction from the bubble. [2][16] |
| Silicone oil | Permanent until surgical removal [2][16] | Until removal [2][16] | Long-term tamponade, clear fundus visualization, and less reliance on prolonged prone positioning. [7] | Requires removal surgery and can cause emulsification, ocular hypertension, cataract, corneal complications, or unexplained visual loss. [5][19] |

## Use air or expansile gas when temporary superior tamponade is sufficient

Gas selection is primarily a duration decision once the retinal configuration and postoperative plan support a temporary buoyant tamponade.

Air is a reasonable final tamponade when PVR risk is low and only brief support is needed after retinopexy. In a primary retinal-detachment series, air was described as particularly applicable when PVR risk was low; it also serves during exchange and removal of perfluorocarbon liquid. Once retinal pigment epithelium–retina adhesion is established, the barrier function of the tamponade is no longer required. [2]

Select SF6 versus C3F8 according to the required support interval. After complete exchange, 20% SF6 lasts about 2 weeks and 14% C3F8 about 8 weeks. Do not substitute undiluted expansile-gas behavior for the expected behavior of a nonexpansile mixture: 100% SF6 can expand about twofold over 1–2 days, whereas 100% C3F8 can expand about fourfold over 3–4 days. [16]

In severe PVR, evidence from the Silicone Study supports C3F8 rather than SF6 when a gas strategy is chosen: C3F8 was as effective as silicone oil and better than SF6 for retinal reattachment in PVR grade C3. By the end of the second year, the difference between SF6 and the other agents diminished; this time-dependent finding should not override the need for early durable tamponade in a high-risk eye. [12]
- For pneumatic retinopexy, use small volumes of undiluted gas; for pars plana vitrectomy, use larger volumes of diluted gas, commonly SF6 20%, C2F6 16%, or C3F8 14%. [16]
- Avoid nitrous oxide anesthesia while an intraocular gas bubble is present because nitrous oxide diffuses into and expands the bubble, risking irreversible ischemic injury. [10]
- Document the gas agent and date of placement in the operative record and communicate its persistence interval when subsequent anesthesia is contemplated. [2][10][16]

*Duration-based gas selection after complete gas-fluid exchange. [2][16]*

| Required temporary support | Preferred agent | Expected persistence | Decision consequence |
| --- | --- | --- | --- |
| About 1 week | Air [2][16] | 5–7 days [2][16] | Consider only when brief coverage and low PVR risk are appropriate. [2] |
| About 2 weeks | SF6 20% [2][16] | About 2 weeks [2][16] | Choose when air is too short-lived but prolonged C3F8 persistence is unnecessary. [2][16] |
| Several weeks | C3F8 14% [2][16] | About 8 weeks [2][16] | Choose when the retinal repair requires the longest commonly used gas support; apply gas-related restrictions for the full bubble duration. [2][10][16] |

## Reserve silicone oil for complex detachments or when gas is unsuitable

Silicone oil trades stronger temporary tamponade force for sustained intraocular support and a planned removal procedure.

Silicone oil is a long-term internal tamponade used principally for rhegmatogenous retinal detachment and PVR. It is particularly useful in complex retinal detachment, for patients unable to comply with postoperative posturing, and when serial fundus visualization is needed while the eye remains tamponaded. Standard light oils float and preferentially support superior pathology. [1][7]

In severe PVR, silicone oil and C3F8 had similar retinal reattachment, visual, and complication outcomes in randomized-study reporting. Thus, the clinically important discriminator is often not average efficacy but whether the patient can safely complete prolonged gas precautions and positioning, whether prolonged internal support is needed, and whether oil-specific complications are acceptable. [12]

For inferior pathology, heavy silicone oils are designed to settle inferiorly because they are formulated with fluorinated compounds. However, heavy oils are not available in the United States according to a retinal-detachment tamponade review, so standard U.S. planning should not assume access to this option. [1][19]

Plan silicone-oil removal as a deliberate second operation once continued tamponade is no longer judged necessary. Longer tamponade duration is associated with greater concern for emulsification and silicone-oil-related visual loss; reports increasingly advocate early removal when anatomically appropriate, with unexplained visual loss reported rarely after short-term tamponade of 8 weeks or less. [5]
- Counsel before oil placement that silicone oil is not self-resorbing and requires surgical removal. [2][16]
- Use postoperative fundus examination to assess retinal status through oil; silicone oil transparency is an operational advantage over an intraocular gas bubble. [7]
- If inferior break support is the principal reason for considering heavy oil, distinguish availability constraints from a general indication for silicone oil. [1][19]

*Silicone-oil selection and surveillance priorities. [1][5][7][19]*

| Clinical situation | Why silicone oil may be selected | Management implication |
| --- | --- | --- |
| Complex retinal detachment or PVR | Provides long-term internal tamponade rather than temporary gas support. [1][7] | Establish a follow-up plan for retinal status, pressure-related complications, and eventual removal. [5][19] |
| Patient cannot maintain prolonged postoperative positioning | Oil permits shorter prone-positioning duration and is used when posturing is not feasible. [7] | Weigh this practical advantage against removal surgery and oil-related adverse effects. [5][7] |
| Need for ongoing fundus visualization | Oil is transparent and allows fundus examination during tamponade. [7] | Use serial examination to identify recurrent detachment or proliferative change before removal. [7] |
| Inferior retinal pathology | Heavy silicone oils settle inferiorly, unlike standard light oil. [1] | Heavy oils are not available in the United States according to the cited review; use an alternative operative strategy when access is absent. [19] |

## Monitor complications according to the implanted agent and intervene before permanent sequelae

Follow-up should target pressure, lens, cornea, retinal attachment, and oil emulsification rather than visual acuity alone.

Measure intraocular pressure during postoperative follow-up after either gas or silicone oil. In Silicone Study reporting, chronic elevated IOP and hypotony occurred with both C3F8 and silicone oil; elevated IOP was significantly more common with silicone oil, whereas hypotony was significantly more common with gas. A pressure abnormality should trigger examination for recurrent detachment, anterior-segment compromise, and agent-related mechanisms rather than attribution to routine postoperative change. [19]

Assess for cataract progression after either gas or oil tamponade. Cataract formation is a common reported complication of both agents, with reported rates up to 100% in the reviewed literature. For silicone-oil eyes, also inspect for emulsified droplets and migration into the anterior chamber, because emulsification and anterior-segment oil are recognized oil-specific complications. [8][19]

At each oil follow-up, evaluate the cornea as well as retinal attachment. At 24 months in Silicone Study reporting, overall corneal abnormality rates were not significantly different between silicone-oil and gas groups, but oil can cause corneal edema, opacity, or need for corneal transplantation within the spectrum of monitored complications. [19]

When visual decline occurs during silicone-oil tamponade or around oil removal without an evident structural explanation, consider silicone-oil-related visual loss. The review definition is a profound decrease of more than 2 Snellen lines during oil tamponade or, more commonly, at oil removal without an apparent explanation; duration of tamponade may increase risk. [5]
- Gas-filled eye: check IOP and retinal attachment; hypotony was relatively more common with gas than silicone oil in Silicone Study reporting. [19]
- Oil-filled eye: check IOP, cornea, lens status, retinal attachment, and signs of emulsification at serial visits. [5][8][19]
- New unexplained loss of more than 2 Snellen lines during oil tamponade or after removal warrants evaluation for silicone-oil-related visual loss after structural causes are excluded. [5]

*Agent-directed complication surveillance after vitreoretinal tamponade. [5][8][19]*

| Finding | Higher-yield context | Next clinical action |
| --- | --- | --- |
| Elevated IOP | More common chronically with silicone oil than C3F8 in Silicone Study reporting. [19] | Perform pressure-focused anterior and posterior segment assessment and manage the identified mechanism. [19] |
| Hypotony | More common with gas than silicone oil in Silicone Study reporting. [19] | Assess retinal attachment and postoperative ocular integrity rather than assuming uncomplicated gas resorption. [19] |
| Emulsified oil or anterior-chamber droplets | Silicone oil, particularly with longer intraocular duration. [5][8] | Reassess timing of oil removal and evaluate associated anterior-segment and pressure complications. [5][8][19] |
| Unexplained visual decline | During silicone-oil tamponade or at removal. [5] | If loss exceeds 2 Snellen lines without apparent explanation, evaluate for silicone-oil-related visual loss and reconsider ongoing oil exposure. [5] |

## Distinguish temporary surgical liquids from postoperative tamponades

Perfluorocarbon liquid is primarily an intraoperative maneuvering agent, not a routine long-term postoperative substitute.

Use perfluorocarbon liquid intraoperatively when its high-density mechanical effect facilitates retinal unfolding or reapposition. In giant retinal tears, perfluoro-octane enabled unfolding of an inverted posterior flap and complete retinal reattachment before endophotocoagulation and final C3F8 or silicone-oil tamponade. [20]

Do not conflate balanced salt solution, lactated Ringer solution, or hydrogels with tamponade agents: they can replace vitreous volume intraoperatively but do not supply the surface-tension barrier across retinal breaks that defines a postoperative vitreous tamponade. [12][15]

For complex surgery requiring perfluorocarbon liquid, explicitly document the transition from the intraoperative liquid to the final air, gas, or silicone-oil agent. Air can be used for exchange and removal of perfluorocarbon liquid, after which the final temporary or long-term tamponade should match the retinal-detachment risk profile. [2]
- Perfluoro-octane: intraoperative retinal unfolding and reapposition in giant retinal tears. [20]
- Air, SF6, C3F8, or silicone oil: postoperative agents selected to maintain break closure while retinopexy adhesion forms. [2][15][16]
- Balanced salt solution and similar aqueous fluids: volume replacement, not retinal-break tamponade. [12][15]

*Functional distinction between intraoperative vitreous substitutes and postoperative tamponades. [2][12][15][20]*

| Agent category | Primary operative role | Postoperative role |
| --- | --- | --- |
| Perfluorocarbon liquid | Temporary surgical tool for retinal unfolding, reapposition, and selected maneuvers. [12][20] | Not the standard long-term final tamponade described for retinal-detachment repair. [2][20] |
| Balanced salt solution or lactated Ringer solution | Intraoperative vitreous-volume replacement. [12][15] | Does not provide tamponade across retinal breaks. [12][15] |
| Air, SF6, C3F8, silicone oil | Can be used at final exchange after retinal repair. [2][16] | Provides the surface-tension barrier that limits fluid passage through retinal breaks while retinopexy adhesion develops. [2][15] |

## References
1. Silicone Oil Applications in Vitreoretinal Surgery - Nature — www.nature.com — https://www.nature.com/nature-index/topics/l4/silicone-oil-applications-in-vitreoretinal-surgery
2. Thirteen year experience of vitrectomy and air tamponade for primary retinal detachment repair with clinical outcomes | Scientific Reports — www.nature.com — https://www.nature.com/articles/s41598-024-79889-9
3. Biocompatibility of intraocular liquid tamponade agents: an update | Eye — www.nature.com — https://www.nature.com/articles/s41433-021-01596-w
4. A new heavy internal tamponade in vitreoretinal surgery: an in vitro study | Eye — www.nature.com — https://www.nature.com/articles/eye2008144
5. Silicone oil in vitreoretinal surgery: indications, complications, new developments and alternative long‐term tamponade agents - Chen - 2021 - Acta Ophthalmologica - Wiley Online Library — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/10.1111/aos.14604
6. Management of retinal detachment and myopia –... : Indian Journal of Ophthalmology — journals.lww.com — https://journals.lww.com/ijo/_layouts/15/oaks.journals/downloadpdf.aspx?an=02223307-990000000-00389
7. Vitreous substitutes and tamponades – A review of types,... : Indian Journal of Ophthalmology — journals.lww.com — https://journals.lww.com/ijo/fulltext/2024/72080/vitreous_substitutes_and_tamponades___a_review_of.6.aspx
8. Silicone oil emulsification in the anterior chamber after vitreoretinal surgery - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1529183906003964
9. The downside of tamponade: Silicone oil emulsification and its ocular impact - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S0039625725002292
10. Vitreoretinal Surgery - an overview | ScienceDirect Topics — www.sciencedirect.com — https://www.sciencedirect.com/topics/medicine-and-dentistry/vitreoretinal-surgery
11. Effect of perfluoropropane (C3F8) versus sulfurhexafluoride (SF6) tamponades on the retinal microvasculature after macular hole surgery - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S1572100023005744
12. Agents for Vitreous Tamponade - StatPearls - NCBI Bookshelf - NIH — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/books/NBK580519
13. Tamponade in surgery for retinal detachment associated with proliferative vitreoretinopathy - Schwartz, SG - 2020 | Cochrane Library — www.cochranelibrary.com — https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD006126.pub4/references
14. In Memory of J. Donald M. Gass (1928–2005) - Ophthalmology — www.aaojournal.org — https://www.aaojournal.org/article/S0161-6420(05)00597-X/fulltext
15. Vitreous substitutes and tamponades – A review of types, applications, and future directions - PMC — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC11451774
16. Tamponade in the surgical management of retinal detachment — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC4801126
17. Tamponade or Filling Effect: Changes of Forces in Myopic Eyes - PMC — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC4101978
18. Incidence and Risk Factors of Elevated Intraocular Pressure Following Vitrectomy Surgery in Rhegmatogenous Retinal Detachment in a Tertiary Hospital in Northern Malaysia - PMC — pmc.ncbi.nlm.nih.gov — https://pmc.ncbi.nlm.nih.gov/articles/PMC12790704
19. Tamponade in the surgical management of retinal detachment - PMC — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801126
20. Management of giant retinal tears without scleral buckling. Use of radical dissection of the vitreous base and perfluoro-octane and intraocular tamponade - PubMed — www.ncbi.nlm.nih.gov — https://www.ncbi.nlm.nih.gov/pubmed/1584565
21. Clinical complications of Densiron 68 intraocular tamponade for complicated retinal detachment | Eye — www.nature.com — https://www.nature.com/articles/eye200957
22. Evaluation of long-term outcomes associated with extended heavy-silicone oil use for the treatment of inferior retinal detachment | Scientific Reports — www.nature.com — https://www.nature.com/articles/s41598-022-15896-y
23. Pars Plana Vitrectomy With Silicone Oil or Gas Tamponade for Uncomplicated Retinal Detachment: A Systematic Review and Meta-Analysis — www.sciencedirect.com — https://www.sciencedirect.com/science/article/pii/S0002939424002095
24. Pharmacological agents for treatment of proliferative vitreoretinopathy: A systematic review and network meta-analysis - ScienceDirect — www.sciencedirect.com — https://www.sciencedirect.com/science/article/abs/pii/S0039625725000335

## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.