Silicone Oil Injection, Endolaser Retinopexy & Retinectomy — Cost, Top Hospitals & Success Rates | MyMedicPlus

Silicone oil injection, endolaser retinopexy, and retinectomy are a trio of vitreoretinal surgical techniques performed together during pars plana vitrectomy (PPV) to manage complex retinal detachments — particularly those complicated by proliferative vitreoretinopathy (PVR). These are the most challenging retinal detachments encountered in clinical practice, and this combined approach represents the highest level of vitreoretinal surgical management.

The Retinal Detachment Problem

Retinal detachment occurs when the sensory retina separates from the underlying retinal pigment epithelium (RPE). Without treatment, photoreceptors die within days to weeks and permanent vision loss results. Most primary retinal detachments are repaired with gas tamponade (SF6 or C3F8) and laser or cryotherapy. However, in a subset of patients — approximately 5–10% of all retinal detachments — scar tissue forms on the surface of the retina or beneath it, a process called Proliferative Vitreoretinopathy (PVR). This scar tissue contracts, creating tractional forces that re-detach the retina despite initial repair, forming rigid retinal folds that prevent the retina from lying flat.

Why Silicone Oil is Used

Silicone oil is an inert, transparent polymer liquid that is heavier in density (specific gravity ~0.97) compared to intraocular fluid and rises to the top of the eye, pressing the upper retina against the RPE. Unlike gas tamponade (which dissolves within 6–8 weeks), silicone oil provides long-term, sustained tamponade that maintains retinal apposition for months while PVR stabilises. This is the critical advantage in complex PVR cases where gas tamponade duration is insufficient.

Two viscosities of silicone oil are used clinically:

• 1000 centistoke (cSt) oil: Lower viscosity, easier to inject and remove through standard vitrectomy ports. Most widely used. Risk of emulsification (breakdown into tiny droplets) is slightly higher than 5000 cSt.
• 5000 cSt oil: Higher viscosity, larger bubble, lower emulsification risk, but more challenging to remove and inject. Preferred for cases requiring very long-term tamponade or in eyes at high emulsification risk.

The combination of silicone oil tamponade with endolaser retinopexy (laser burns sealing the retinal breaks) and, when required, retinectomy (surgical removal of scarred, non-compliant retina) provides the best chance of long-term retinal reattachment in the most complex retinal diseases.

This combined surgical approach is reserved for retinal detachments that are too complex for standard gas tamponade and laser alone. The key indications include:

Proliferative Vitreoretinopathy (PVR) — Primary Indication

PVR is classified by the Retinal Society Terminology Committee (updated 2012) into:

• Grade A: Vitreous haze and pigment clumps — no silicone oil needed
• Grade B: Wrinkling of the inner retinal surface — may still be managed with gas
• Grade C: Full-thickness rigid retinal folds in one or more quadrants — silicone oil tamponade is typically indicated. Subdivided by clock hours affected (C1–C12).
• Grade D (anterior PVR): Anterior retinal displacement with circumferential contraction ("napkin ring") — the most severe form, requiring retinectomy in addition to silicone oil.

Complex Rhegmatogenous Retinal Detachments

• Giant retinal tears (GRT, ≥90°) — the large tear flap may fold back on itself; silicone oil prevents displacement during positioning
• Posterior retinal breaks (breaks at or posterior to the equator) — prone to PVR and difficult to tamponade with gas
• Multiple retinal breaks in multiple quadrants
• Inferior retinal breaks in patients who cannot maintain face-down positioning (elderly, disabled, severe sleep apnoea)

Tractional Retinal Detachment

• Diabetic tractional retinal detachment — following vitreous haemorrhage with tractional membranes that detach the macula or threaten central vision
• Sickle cell retinopathy with peripheral proliferative changes

Inferior Retinal Breaks

Heavy silicone oil (HSO) — a perfluorocarbon-silicone oil blend with specific gravity >1.0 (heavier than water) — sinks to the inferior pole of the eye and is used specifically for inferior retinal breaks and inferior PVR, where standard lighter silicone oil provides no inferior tamponade. HSO products include Densiron-68 and Oxane HD.

Failed Previous Retinal Detachment Surgery

Eyes with recurrent or persistent detachment after previous gas tamponade, scleral buckle, or initial silicone oil fill and re-PVR formation often require retinectomy with renewed silicone oil fill.

Patient selection for this complex vitreoretinal procedure requires careful ophthalmic and systemic assessment by an experienced vitreoretinal surgeon:

Ophthalmic Assessment

• Slit-lamp biomicroscopy: Anterior segment examination for rubeosis iridis (new vessel growth on the iris — risk of severe surgical haemorrhage and post-operative glaucoma), corneal disease (which may limit intraoperative visualisation), and lens status (phakic eyes may require combined cataract extraction).
• B-scan ultrasonography: Essential when the media is opaque (dense vitreous haemorrhage, cataract). Identifies extent of retinal detachment, choroidal detachment, posterior staphyloma, and intraocular foreign bodies.
• PVR grading: Clinical examination under dilated pupils determines PVR grade and extent, guiding surgical planning. The star-fold pattern and anterior displacement of the vitreous base must be documented.
• ERG (electroretinogram): In longstanding detachments, the ERG assesses residual photoreceptor function and helps predict post-operative visual potential. A flat ERG suggests photoreceptor death and limits visual prognosis.
• Intraocular pressure (IOP): Hypotony (<6 mmHg) suggests ciliary body detachment; elevated IOP requires pre-operative management to avoid choroidal effusion on table.

Lens Status and Surgical Planning

• Silicone oil and a silicone intraocular lens (IOL) are incompatible — silicone oil adheres to silicone IOL surfaces, causing permanent opacification. Patients with silicone IOLs require explantation and exchange to an acrylic or PMMA IOL before oil tamponade.
• Phakic patients (natural lens in place) often undergo combined phacovitrectomy (cataract extraction + vitrectomy) to improve intraoperative visualisation, prevent lens opacification from silicone oil contact, and simplify future oil removal.

Systemic Considerations

• Anticoagulant medication management (warfarin, direct oral anticoagulants) in consultation with the prescribing physician
• Diabetic patients require optimised glycaemic control (HbA1c <69 mmol/mol) to reduce surgical healing risks
• Counselling on realistic visual prognosis — especially in eyes with chronic macular detachment (>3 months), where photoreceptor recovery is incomplete

The combined procedure is performed under the operating microscope with a wide-angle viewing system (BIOM or RESIGHT) that provides a 100–130° field of view of the retina:

Pars Plana Vitrectomy (PPV)

Three 23- or 25-gauge self-sealing sclerotomies are placed 3.5–4.0 mm posterior to the limbus (pars plana) to access the vitreous cavity. The vitreous gel is removed with a high-speed vitreous cutter (10,000 cuts per minute for 25-gauge systems). Tractional membranes (epiretinal membranes, subretinal membranes) are peeled with end-gripping forceps and microscissors. The vitreous base is shaved to the periphery using scleral indentation to ensure complete removal — incomplete vitreous base removal is a major cause of recurrent PVR and re-detachment.

Perfluorocarbon Liquid (PFCL) Exchange

After vitrectomy and membrane dissection, perfluorocarbon liquid (PFCL — e.g., perfluorooctane, SG ~1.76) is injected into the vitreous cavity. Being heavier than water, PFCL sinks to the posterior pole and unfolds the detached retina centrifugally, pushing subretinal fluid anteriorly through the retinal breaks. This allows the surgeon to work on a flat, stable retinal surface.

Endolaser Retinopexy

Laser photocoagulation is applied through an endolaser probe inserted into the eye to seal all retinal breaks and create a laser scar barrier:

• Targeted retinopexy: 2–3 rows of laser burns applied around each identified retinal break. Each burn should produce a white-grey blanching reaction in the RPE. Laser is applied while PFCL holds the retina flat.
• 360-degree peripheral retinopexy (laser barrage): In eyes with PVR or multiple breaks, a continuous ring of laser burns is placed around the entire peripheral retina (at the posterior edge of the vitreous base). This creates a complete circumferential adhesion barrier that prevents anterior re-detachment and limits the impact of any undetected breaks.

Retinectomy (for Grade D PVR and Rigid Inferior Folds)

When scarred retinal tissue is so contracted and rigid that it cannot be flattened by membrane peeling or PFCL alone, a relaxing retinectomy is performed:

• The contracted peripheral retinal ring is excised with vitreoretinal scissors (typically inferiorly at the site of maximum contraction)
• The freed posterior retina can then lie flat against the RPE
• Retinectomy is followed immediately by extensive laser retinopexy to the cut retinal edge and posterior to it, then silicone oil fill
• Retinectomy extent: typically 180° (inferior half) for diffuse anterior PVR; may extend to 270° in severe cases

Silicone Oil Fill (PFCL-to-Oil Exchange)

After endolaser, the PFCL is exchanged for silicone oil in a fluid-air-then-air-oil sequence:

1. Air is injected to replace PFCL (PFCL-to-air exchange), expressing subretinal fluid through breaks
2. Silicone oil (1000 or 5000 cSt) is injected through a backflush or pressurised injection system while air is aspirated simultaneously, maintaining intraocular pressure
3. The eye is filled with approximately 4–5 mL of silicone oil — achieving >90% fill volume is the target

Postoperatively, patients with superior pathology are positioned face-up (oil rises, tamponades superior retina). Inferior breaks require face-down positioning if standard oil is used, or HSO (heavy silicone oil) is used instead.

Silicone oil tamponade with endolaser and retinectomy achieves retinal reattachment in cases that would otherwise result in complete visual loss. The benefits must be understood in the context of the severity of disease being treated:

Anatomical Retinal Reattachment

In prospective studies of PVR-complicated retinal detachment, silicone oil tamponade achieves anatomical retinal reattachment rates of:

• Grade C PVR: 80–90% at 12 months (single or multiple surgeries combined)
• Grade D PVR with retinectomy: 70–85% retinal attachment at 12 months; a proportion require oil replacement or repeat surgery
• Primary anatomical success (single operation): 60–75% for PVR C–D cases

The Silicone Study (Vitreous Study Group, NEJM 1992) — a landmark prospective randomised trial — compared silicone oil to long-acting gas (C3F8) for PVR. Silicone oil achieved equivalent anatomical success rates and significantly better visual outcomes at 36 months in patients requiring post-operative positioning limitations, confirming the role of silicone oil as the tamponade of choice in PVR.

Visual Outcomes

• In Grade C PVR: 60–75% achieve a final visual acuity of 20/400 or better; 30–40% achieve 20/100 or better
• In Grade D PVR with retinectomy: 50–65% achieve light perception or better; 30–50% achieve ambulatory vision (20/400 or better)
• Macular detachment duration strongly predicts visual outcome: <1 week macula-off detachment before repair achieves far better central vision than >3 months detachment

Prevention of Phthisis Bulbi

In eyes with extensive PVR and ciliary body tractional detachment, silicone oil tamponade maintains intraocular pressure and prevents hypotony-related phthisis (shrinkage and atrophy of the globe) — preserving the eye cosmetically even when visual restoration is limited.

Long-Term Stability

Silicone oil maintains retinal position for the months required for PVR to burn out and stabilise, after which oil removal can be safely undertaken. This sustained tamponade is the fundamental advantage over gas, which dissolves before PVR stabilises.

This is high-complexity vitreoretinal surgery with a recognised complication profile. Patients should be counselled that complications are more common than in standard retinal surgery due to the severity of underlying disease:

Silicone Oil-Specific Complications

• Silicone oil emulsification: Over time (typically after 6–18 months), silicone oil can break into fine droplets (emulsified oil), which invade the anterior chamber, trabecular meshwork, and subretinal space. Emulsification causes a milky haze in the visual axis and can elevate intraocular pressure. Risk is higher with lower viscosity oils (1000 cSt), excessive agitation, and prolonged retention. Timely oil removal (3–6 months) significantly reduces emulsification risk.
• Ocular hypertension and glaucoma: Elevated IOP occurs in 10–40% of eyes with long-term silicone oil. Mechanisms include oil blocking the trabecular meshwork, pupillary block (oil in aphakic eyes), and pre-existing angle damage. Managed with IOP-lowering eye drops and, if refractory, filtration surgery or cyclodestruction.
• Band keratopathy: Calcium deposits in the corneal epithelium and Bowman's layer cause a white horizontal band across the cornea (in the 3–9 o'clock interpalpebral zone). Associated with long-term ocular hypotony, chronic inflammation, or silicone oil in the anterior chamber. Treated by superficial keratectomy and EDTA chelation. Timely oil removal prevents progressive band keratopathy.
• Cataract (in phakic patients): Contact between silicone oil and the crystalline lens causes posterior subcapsular lens opacity. Oil in phakic eyes mandates careful surgical technique (complete fill, adequate pupil dilation) and vigilant follow-up. Many surgeons prefer combined phaco-vitrectomy to eliminate this risk.
• Hypotony after oil removal: Following silicone oil removal, some eyes develop persistently low IOP (hypotony, <6 mmHg). Caused by ciliary body dysfunction due to prolonged traction, PVR involving the pars plana, or incomplete reattachment of the ciliary body. Hypotony can lead to choroidal folds, macular oedema, and progressive phthisis. Risk is highest in eyes with pre-operative hypotony and anterior PVR.

Retinectomy-Specific Risks

• Intraoperative haemorrhage: Retinal cutting can injure peripheral retinal blood vessels. Adequate diathermy coagulation of retinal vessels before cutting is essential.
• Re-detachment after oil removal: Up to 20–30% of eyes with Grade D PVR develop re-detachment after oil removal, requiring repeat vitrectomy and oil refill.

General Surgical Risks

• Endophthalmitis (intraocular infection): <0.05% per procedure
• Choroidal haemorrhage (expulsive or suprachoroidal): rare but sight-threatening
• Iatrogenic retinal breaks from instrument passage
• Anaesthetic complications (especially with general anaesthesia in elderly patients)

Post-operative management is as critical as the surgery itself. The following protocol is applied in most vitreoretinal centres:

Immediate Post-Operative Period (Days 0–7)

• Positioning: Face-down positioning for 50 minutes per hour for the first 24–48 hours is advised for eyes with superior retinal breaks (silicone oil rises and tamponades superiorly). For inferior breaks treated with heavy silicone oil (HSO), face-up positioning is recommended. Patients should sleep on the side of the operative eye (side of the break, not face-down).
• Eye drops: Topical antibiotic (chloramphenicol 0.5% or moxifloxacin) 4 times daily for 1–2 weeks; topical steroid (dexamethasone 0.1% or prednisolone 1%) 4 times daily, tapering over 6–8 weeks; cycloplegic (atropine 1% or cyclopentolate 1%) to prevent posterior synechiae (iris adhesions) in inflamed eyes.
• IOP check: Intraocular pressure measured at Day 1, Day 7, and each subsequent visit. Target IOP: 10–20 mmHg. Elevations >25 mmHg treated with topical IOP-lowering agents (timolol, dorzolamide, brimonidine) and occasionally systemic acetazolamide.

Weeks 2–12

• Clinic visits at 2 weeks, 4 weeks, 6 weeks, and 3 months
• Fundoscopy and IOP monitoring at each visit
• B-scan ultrasonography to confirm retinal position if media clarity is limited
• Watch for early signs of emulsification (milky oil interface, anterior chamber flare, IOP elevation)

Silicone Oil Removal (3–6 Months)

Standard silicone oil (1000 or 5000 cSt) should be removed 3–6 months after insertion in most cases:

• Oil removal avoids progressive complications — emulsification, band keratopathy, glaucoma, and cataract
• Oil removal is performed under local or general anaesthesia via pars plana vitrectomy; passive drainage through the vitrectomy port allows oil to self-express once ports are opened, supplemented by gentle active aspiration
• If the retina is stable and re-attachment is confirmed, oil removal proceeds. If re-PVR or re-detachment is suspected, further membrane peeling and oil replacement may be required at the same sitting
• Post-oil-removal hypotony must be monitored; silicone oil provides a pressure scaffold, and its removal may unmask underlying ciliary body dysfunction

Long-Term Review

Eyes with a history of complex PVR and silicone oil require indefinite annual ophthalmic review, even after successful oil removal, to detect late re-detachment, macular pucker, CMO (cystoid macular oedema), and glaucoma progression.

This complex vitreoretinal surgery requires highly specialised expertise and equipment. Cost is correspondingly higher than standard retinal detachment repair:

Global Cost Benchmarks (Self-Pay / Private)

• India (leading vitreoretinal centres — LV Prasad Eye Institute, Sankara Nethralaya, Aravind Eye Hospital, AIIMS): USD 2,000–5,000 for primary vitrectomy with silicone oil; USD 1,500–3,000 for subsequent oil removal. India is a world leader in affordable high-quality vitreoretinal surgery with fellowship-trained surgeons performing hundreds of complex PVR cases annually.
• United Kingdom (NHS): Complex PVR vitrectomy is funded by the NHS for eligible patients at no direct cost; treated at regional vitreoretinal units. Private cost: GBP 6,000–12,000 per procedure.
• United States: USD 8,000–18,000 per procedure (facility + surgeon + anaesthesia). Insurance coverage depends on medical necessity documentation.
• Germany / Switzerland: EUR 8,000–15,000 at private hospitals
• Thailand / Singapore: USD 5,000–10,000 at internationally accredited eye centres

Cost Components

• Surgical fee: Vitreoretinal surgeons with PVR subspecialty training command premium fees; typically USD 1,500–4,000 per procedure
• Silicone oil: Standard silicone oil (OXANE 1000/5000, Bausch+Lomb) approximately USD 100–200 per unit; heavy silicone oil (Densiron-68) USD 300–500
• Endolaser system: Included in facility/theatre costs; PASCAL or IRIDEX endolaser equipment adds to procedure-level overhead
• Operating microscope and wide-angle viewing system: Capital equipment costs are absorbed into theatre fees
• Post-operative visits: 6–8 specialist clinic visits over 3–6 months, each involving slit-lamp biomicroscopy and IOP measurement
• Oil removal surgery: Charged as a separate surgical episode, typically 50–60% of primary procedure cost

For patients in the UK without NHS access, and for international patients, India represents an outstanding value destination for complex vitreoretinal surgery. Many patients combine surgery at a centre of excellence with a brief recovery period before returning home for local follow-up.

Silicone oil is the most widely used long-term tamponade in complex retinal surgery, but several alternatives exist and are selected based on clinical circumstances:

Intraocular Gas Tamponade

Gas tamponade (sulphur hexafluoride SF6 — 14 days; perfluoropropane C3F8 — 6–8 weeks) remains the tamponade of choice for simple or moderate-complexity retinal detachments without significant PVR. Gas dissolves spontaneously and does not require a second surgical procedure for removal. However, in Grade C–D PVR, gas tamponade duration is insufficient for retinal stabilisation, and re-detachment rates are significantly higher than with silicone oil. Patients must maintain strict face-down positioning while gas is present and cannot fly or undergo nitrous oxide anaesthesia.

Heavy Silicone Oil (HSO)

Perfluorocarbon-silicone oil blends (specific gravity 1.02–1.06) are heavier than water and sink to the inferior pole — the opposite of standard silicone oil. HSO (Densiron-68, Oxane HD) is used for inferior retinal breaks and inferior PVR Grade C where standard oil provides no inferior tamponade. Advantages include eliminating the need for face-down positioning. Disadvantages include a higher rate of emulsification, greater inflammatory response, and technically more challenging removal. HSO is generally removed at 3–6 months, as for standard oil.

Scleral Buckle

External support of the eye with a silicone band or plombe (scleral buckle) indents the scleral wall, mechanically closing retinal breaks from outside. Buckle alone is appropriate for straightforward rhegmatogenous RD without PVR. In PVR cases, a scleral buckle is often combined with vitrectomy to provide external support to the vitreous base and reduce the risk of recurrent anterior PVR after vitrectomy. Buckle alone is insufficient for Grade C–D PVR.

Pneumatic Retinopexy

Office-based injection of an intravitreal gas bubble combined with cryotherapy or laser for carefully selected, superior single-break retinal detachments without PVR. Not appropriate for PVR or complex detachments requiring silicone oil.

No Surgery (Observation)

For eyes with pre-existing bare light perception or no light perception with an established total retinal detachment where surgical prognosis for visual recovery is negligible, careful observation with IOP management to prevent glaucoma may be preferred over extensive surgery, after informed consent discussion with the patient.