A retinal detachment occurs when the retina separates from the tissue supporting it at the back of the eye. Because the retina is responsible for sensing light and sending visual information to the brain, a detachment can threaten vision and often requires prompt treatment.
Vitrectomy is one of the main surgical techniques used to repair certain retinal detachments. During the procedure, the surgeon removes the vitreous gel that is pulling on the retina, identifies and treats retinal breaks, removes fluid from beneath the retina when necessary, and places a temporary internal support such as a gas bubble or silicone oil.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The goal is to return the retina to its normal position and keep it there long enough for the treated retinal breaks to seal. You can learn more about vitrectomy and its applications on the Vitrectomy page.
Why Does a Retinal Detachment Need to Be Repaired?
The retina is a thin, light-sensitive layer lining the inside of the eye. When it becomes detached, its normal relationship with the underlying tissue is disrupted.
A common type is rhegmatogenous retinal detachment, which occurs when a retinal tear or break allows fluid to pass underneath the retina.
As more fluid enters beneath the retina, the detached area can expand. If the macula—the central part of the retina responsible for detailed vision—becomes detached, central vision can be significantly affected.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Because untreated retinal detachment can result in permanent vision loss, retinal reattachment is the primary goal of treatment.
How Does Vitrectomy Repair a Detached Retina?
Vitrectomy addresses several parts of the problem rather than simply pushing the retina back into place. The procedure generally involves these key steps:
- Small openings are made in the eye.
- The vitreous gel is removed.
- Traction pulling on the retina is relieved.
- Retinal tears or breaks are identified.
- Fluid beneath the retina is drained or displaced.
- Laser or another method is used to seal the retinal breaks.
- A gas bubble or silicone oil may be placed inside the eye to support the retina.
Step 1: Removing the Vitreous Gel
The vitreous is a transparent, gel-like substance that fills much of the inside of the eye. With retinal detachment, the vitreous may be pulling on the retina or may be contributing to the movement of fluid through a retinal break. During vitrectomy, specialised instruments are introduced through tiny openings in the white part of the eye.
The surgeon removes the vitreous and carefully clears the areas where it is exerting traction on the retina. Removing the vitreous creates the working space needed to examine the retina and perform the remaining repair.
Step 2: Releasing Traction on the Retina
Vitreous strands can exert traction on a retinal tear or detached retina. If this pulling force remains, simply repositioning the retina may not be enough to keep it attached.
The surgeon therefore removes the vitreous around the affected areas and releases abnormal traction. In more complex retinal detachments, additional scar tissue may also need to be removed or carefully separated from the retinal surface.
Step 3: Finding the Retinal Tears or Breaks
In a rhegmatogenous retinal detachment, identifying and treating the retinal breaks is essential. The surgeon examines the entire retina to locate the tears that allowed fluid to pass underneath it.
Finding all relevant breaks helps prevent fluid from continuing to enter the space beneath the retina after surgery. Retinal breaks can vary in number, size and location, so the surgical approach is adapted to the individual eye.
Step 4: Flattening the Retina
Once the vitreous traction has been addressed, the surgeon works to remove or displace the fluid that has collected underneath the detached retina.
This may be achieved through a controlled fluid-air exchange or by draining the subretinal fluid through an existing retinal break. In more complex cases, specialised fluids may also be used temporarily to help flatten and stabilise the retina. As the fluid is removed, the retina can return toward the wall of the eye.
Step 5: Sealing the Retinal Breaks
After the retina has been repositioned, the retinal tears need to be sealed so that fluid cannot pass through them again. During vitrectomy, the surgeon commonly uses endolaser around the retinal breaks. Laser treatment creates controlled areas of scarring that help form a stronger attachment between the retina and the underlying tissue.
In some situations, freezing treatment called cryotherapy may be used instead of or in addition to laser treatment. The purpose is not simply to close the visible tear immediately. The treatment creates a lasting adhesion around the break so that the retina can remain attached after the temporary internal support is gone.
Step 6: Placing a Gas Bubble or Silicone Oil
After the retina has been flattened and the breaks treated, the surgeon may place an internal tamponade inside the eye. This can be:
- A gas bubble: The gas gradually disappears and is naturally replaced by the eye's own fluid.
- Silicone oil: The oil can provide longer-term internal support and may need to be removed during another operation in some cases.
The choice depends on the characteristics of the retinal detachment, the condition of the eye and the type and duration of support required.
How Does the Gas Bubble Help the Retina?
The gas bubble acts as an internal support while the treated retinal breaks heal. Because the bubble floats inside the eye, its position relative to the retinal break matters. This is why some patients are instructed to keep their head in a particular position after surgery.
Correct positioning can help keep the bubble against the area that needs support. Gas bubbles are gradually absorbed over time. The length of time they remain in the eye depends on the type of gas used.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Is Vitrectomy the Only Surgery for Retinal Detachment?
No. Vitrectomy is one of several surgical approaches used to repair retinal detachment. Other options include:
| Procedure | Basic approach |
|---|---|
| Vitrectomy | Removes vitreous traction, treats retinal breaks and uses internal tamponade to support the retina. |
| Scleral buckle | Places a supportive band around the outside of the eye to reduce traction and support the area of the retinal break. |
| Pneumatic retinopexy | Uses a gas bubble placed inside the eye to position the retina against the eye wall, combined with laser or cryotherapy. |
Some retinal detachments are treated with a combination of procedures. The choice depends on factors such as the location and number of retinal breaks, the extent of the detachment, vitreous traction, previous eye surgery and the overall condition of the retina.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
How Long Does Vision Take to Improve?
Vision after retinal detachment surgery does not necessarily become clear immediately, even when the retina has been successfully reattached. The recovery depends on factors such as:
- Whether the macula was detached before surgery
- How long the retina was detached
- The extent and location of the detachment
- The condition of the retinal tissue
- Whether a gas bubble or silicone oil was used
- Whether additional retinal procedures were required
What Are the Risks of Vitrectomy for Retinal Detachment?
Vitrectomy is an established treatment for retinal detachment, but it carries potential risks. Possible complications include:
- Recurrent retinal detachment
- Retinal tears or new retinal breaks
- Infection inside the eye
- Bleeding
- Increased eye pressure
- Cataract development or progression
- Inflammation
- Problems related to the gas bubble or silicone oil
- Need for additional retinal surgery
The risk profile depends on the complexity of the retinal detachment and the patient's individual eye condition.
What Does Successful Retinal Detachment Surgery Mean?
There are two different outcomes to consider: anatomical success and visual recovery. Anatomical success means that the retina has been successfully returned to its normal position and remains attached.
Visual recovery depends on the health of the retinal tissue, particularly the macula, and on how much damage occurred before the repair.
This distinction is important because a retina can be successfully reattached while vision remains limited because the retinal cells have already been affected by the detachment.
The Bottom Line
Vitrectomy repairs certain retinal detachments by addressing the forces and retinal breaks that caused the retina to separate. The surgeon removes the vitreous gel, releases traction, identifies and treats retinal breaks, removes or displaces fluid beneath the retina and uses internal tamponade when needed.
A gas bubble or silicone oil can provide temporary or longer-term support while the treated retina heals. When a gas bubble is used, strict instructions about positioning and air travel are particularly important.
Retinal detachment is a potentially sight-threatening condition, and treatment is highly individual. Vitrectomy is one established surgical option, but the best approach depends on the location and extent of the detachment, the retinal breaks, the condition of the vitreous and the overall health of the eye.
Even after successful reattachment, visual recovery can take time and depends greatly on whether the macula was affected before surgery. Prompt assessment of new flashes, sudden floaters, shadows or a curtain-like loss of vision remains important because earlier treatment can help protect remaining vision.
