Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas

Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is an intraocular gas used in eye surgery to help the retina heal.

Drug class	Retinal Tamponade
Type	Single
Forms	Intraocular Gas
Common strength	20% SF6 / 14% C3F8
Common Indian brands	SF6 / C3F8 intraocular gas
Prescription status	Prescription (hospital use)

What Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is used for

Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is a special type of gas used inside the eye during certain surgeries. It acts like a temporary internal bandage to support the healing process of your retina. This gas is specifically used in:

Retinal detachment surgery: This is a serious condition where the retina, the light-sensitive tissue at the back of your eye, pulls away from its normal position. The gas helps to push the retina back into place.
Macular hole surgery: A macular hole is a small tear in the macula, the central part of your retina responsible for sharp, detailed vision. The gas helps to close this hole and promote healing.

In both these situations, the gas bubble plays a crucial role in holding the retina firmly against the back wall of your eye while it naturally reattaches and heals. This support is vital for successful surgical outcomes and for preserving your vision.

How it works

Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas works by forming an inert gas bubble inside your eye. ‘Inert’ means it doesn’t react chemically with your eye tissues. After it is injected during surgery, this gas bubble floats upwards within the eye. Its natural buoyancy causes it to press gently but firmly against the retina. This pressure helps to hold the retina in its correct position, allowing it to reattach and heal properly against the back wall of your eye. Think of it like a tiny, temporary internal splint or cushion that keeps the delicate retinal tissue in place until it seals naturally. Over time, your body gradually absorbs this gas bubble, and it disappears completely, leaving no residue.

How it’s used

Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is not something you administer yourself. It is a specialized medical gas that is injected into your eye by an ophthalmologist during retinal detachment surgery or macular hole surgery. This procedure is performed in a hospital or clinic setting under sterile conditions.

Typically, the gas is injected once during the surgery. The amount and type of gas (20% SF6 or 14% C3F8) will be determined by your surgeon based on your specific condition and the needs of the surgery. After the injection, the gas bubble remains in your eye for a period of time, providing the necessary support for healing.

The gas bubble does not stay in your eye permanently. Your body gradually absorbs it over time. Depending on the type of gas used and your individual healing process, the gas bubble typically absorbs and disappears completely within 2 to 8 weeks. Your doctor will monitor your progress and let you know what to expect regarding the gas absorption.

It is very important to follow all post-operative instructions given by your ophthalmologist, especially regarding head positioning. In some cases, strict face-down posturing may be required for a certain period after surgery. This specific positioning helps the gas bubble to press against the correct part of your retina, maximizing its therapeutic effect. Your surgical team will provide detailed guidance on how to maintain this posture and for how long.

Always follow your ophthalmologist’s exact instructions.

Brands available in India

SF6 / C3F8 intraocular gas

Brand availability and pricing vary; confirm with your pharmacist.

Good to know

Prescription eye medicine — use only as directed by a qualified ophthalmologist. This page is for general education and is not a substitute for professional medical advice, diagnosis or a prescription. Do not self-medicate or reuse an old prescription. This is given only by specialists in a hospital or clinic setting and is never for self-use.

Precautions & side effects

While Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is a vital tool in eye surgery, there are critical precautions you must be aware of to ensure your safety and the success of your surgery:

DO NOT FLY IN AN AEROPLANE OR TRAVEL TO HIGH ALTITUDE: This is an extremely important precaution. While the gas bubble is in your eye, you must absolutely avoid flying in an aeroplane or travelling to any high-altitude locations (such as mountains). The change in atmospheric pressure at high altitudes causes the gas bubble inside your eye to expand significantly. This expansion can lead to a dangerous increase in pressure within your eye, which can cause severe pain, damage to your optic nerve, and potentially permanent blindness. Your doctor will advise you on when it is safe to fly or travel to high altitudes, typically after the gas has completely absorbed.
STRICT FACE-DOWN POSTURING: Depending on the type of surgery and the location of the retinal issue, your ophthalmologist may instruct you to maintain a strict face-down position for a certain period after surgery. This means keeping your head positioned so that your nose points towards the floor, even when sleeping. This specific posture helps the gas bubble to press against the target area of your retina, which is crucial for successful healing and reattachment. It is vital to follow these instructions precisely, as failing to do so can compromise the surgical outcome. Your medical team will provide detailed instructions and tips on how to manage this posturing.
PRESCRIPTION MEDICINE: This is a prescription eye medicine and is only used by qualified ophthalmologists in a hospital or clinic setting. It is never for self-use.
GENERAL WARNING: This page provides general education and is not a substitute for professional medical advice, diagnosis, or a prescription. Do not self-medicate or reuse an old prescription. Always consult your ophthalmologist for any concerns or questions about your treatment.

Welcome to Pristine Eye Hospitals. We understand that undergoing eye surgery can be a significant event, and we are here to provide you with all the necessary information to feel comfortable and confident about your treatment. This page aims to educate you about Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas, a special gas used in certain eye surgeries.

The eye is a complex and delicate organ, and the retina plays a crucial role in our vision. The retina is a thin layer of tissue at the back of the eye that senses light and sends images to your brain. When the retina is damaged, as in conditions like retinal detachment or macular hole, it can severely impact your vision. Our goal is to help you understand these conditions and how modern surgical techniques, including the use of intraocular gas, help restore your eye health.

Understanding Retinal Conditions Treated

Retinal Detachment: Imagine the wallpaper peeling off a wall; this is similar to what happens in a retinal detachment. The retina, which is normally attached to the back of your eye, pulls away. This is a medical emergency because if left untreated, it can lead to permanent vision loss. Symptoms can include sudden flashes of light, new floaters (specks or cobwebs that drift across your vision), or a shadow or curtain appearing in your field of vision. Surgery is often required to reattach the retina, and this is where the intraocular gas plays a vital role.

Macular Hole: The macula is the central part of your retina responsible for sharp, detailed vision, allowing you to read, recognise faces, and see colours clearly. A macular hole is a small break or tear in this crucial area. It can cause blurred central vision, distorted vision (straight lines appearing wavy), or a blind spot in your central vision. Surgery is performed to close this hole, and the gas bubble helps to hold the edges of the hole together while it heals.

In both these surgeries, the Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas bubble acts as an internal splint, gently pushing the retina back into its proper position and holding it there until it naturally reattaches and heals. This support is critical for the success of the surgery and for preserving your vision.

General Post-Operative Care and Hygiene

After your eye surgery involving intraocular gas, meticulous care and hygiene are essential to prevent complications and ensure the best possible outcome. Your ophthalmologist and the nursing staff will provide you with specific instructions, but here are some general guidelines:

Hand Hygiene: Always wash your hands thoroughly with soap and water before touching your eye or applying any prescribed eye drops. This is crucial to prevent infection.
Avoid Rubbing Your Eye: It is natural to feel some discomfort or irritation after surgery, but resist the urge to rub your eye. Rubbing can dislodge the gas bubble, interfere with healing, or introduce infection.
Protect Your Eye: You may be given an eye shield to wear, especially at night, to protect your eye from accidental bumps or pressure. Wear it as instructed.
Follow Eye Drop Schedule: You will likely be prescribed eye drops to prevent infection and reduce inflammation. Use them exactly as directed by your doctor, even if your eye feels better. Do not skip doses or stop using them prematurely.
Avoid Strenuous Activities: For a period after surgery, avoid heavy lifting, bending over, or any activities that might increase pressure in your eye or cause sudden head movements. Your doctor will advise you on when you can resume normal activities.
Bathing and Washing Hair: Be careful when bathing or washing your hair to prevent water or soap from entering your operated eye. You might be advised to tilt your head back or use a clean cloth to gently clean around the eye.

Remember, the gas bubble is a temporary support. It will gradually be absorbed by your body. During this period, it is normal for your vision to be blurry, and you might see a dark line or ‘water level’ at the bottom of your vision, which indicates the top of the gas bubble. As the gas absorbs, this line will move down, and your vision will slowly improve.

When to Seek Medical Help

While most patients recover well after surgery, it is important to be aware of signs that might indicate a complication. Contact Pristine Eye Hospitals immediately or seek emergency medical attention if you experience any of the following:

Sudden, severe eye pain that is not relieved by prescribed pain medication.
Sudden decrease in vision or complete loss of vision.
New or worsening redness in the eye.
Pus or discharge from the eye.
Flashes of light or new floaters.
Any symptoms of infection, such as fever or chills.
If you accidentally fly in an aeroplane or travel to high altitude while the gas is still in your eye. This is a critical emergency and requires immediate medical attention.

Your health and vision are our top priority. Always communicate any concerns or changes in your condition to your ophthalmologist promptly. We are here to support you throughout your recovery journey.

Frequently asked questions

What is Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas used for?

Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas is an intraocular gas used in eye surgery to treat conditions like retinal detachment and macular holes. It helps to hold the retina in place while it heals.

How does Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas work?

It works by forming an inert gas bubble inside the eye. This bubble floats up and gently presses the retina back against the wall of the eye, helping it to reattach and seal until it heals naturally.

What are the common brands of this intraocular gas in India?

The common brands for this intraocular gas are simply referred to as SF6 / C3F8 intraocular gas.

How is Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas used?

It is injected once into the eye during surgery by an ophthalmologist. It is not for self-use. The gas bubble then gradually absorbs over 2 to 8 weeks.

Do I need a prescription for Sulphur Hexafluoride (SF6) / Perfluoropropane (C3F8) Gas?

Yes, it is a prescription medicine and is only administered by specialists in a hospital or clinic setting. It is never for self-use.

What are the key precautions I need to take with this gas in my eye?

The most critical precaution is that you must NOT fly in an aeroplane or travel to high altitude while the gas is in your eye, as the bubble will expand and can cause blindness. Strict face-down posturing may also be required after surgery.

References

Medically reviewed by Dr. C Jagadesh Reddy, Chief Surgeon: Cornea, Cataract and Refractive Surgery — last reviewed 2026-07-28.

This page is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Never self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist before starting, changing or stopping any eye medicine.