23-gauge vitrectomy: Definition, Uses, and Clinical Overview

Posted on February 27, 2026 | by dreye

23-gauge vitrectomy Introduction (What it is)

23-gauge vitrectomy is a type of vitreoretinal surgery that uses very small instruments (23-gauge) to work inside the eye.
It is most often performed as a pars plana vitrectomy, meaning the surgeon enters through the white part of the eye near the colored iris without going through the cornea.
The goal is typically to remove some or all of the vitreous gel and treat problems affecting the retina and macula.
It is commonly used in modern retinal surgery because the smaller instrument size can allow smaller incisions.

Why 23-gauge vitrectomy used (Purpose / benefits)

The vitreous is a clear, gel-like material that fills the back of the eye and sits in front of the retina (the light-sensing tissue). In many retinal diseases, the vitreous can:

Pull on the retina or macula (traction), distorting vision
Cloud with blood or inflammatory debris, blocking light from reaching the retina
Contribute to retinal tears or detachments by transmitting abnormal forces
Limit access to the retinal surface when surgical repair is needed

A 23-gauge vitrectomy is used to create controlled access to the back of the eye so the surgeon can remove vitreous gel and perform additional retinal treatments in the same procedure. The “23-gauge” part refers to the diameter of the instruments: in the gauge system, higher numbers generally mean thinner instruments.

Potential practical benefits often associated with small-gauge surgery (including 23-gauge) may include:

Smaller entry sites (sclerotomies), which may reduce the need for sutures in some cases
Efficient instrument stiffness and flow characteristics compared with even smaller gauges (details vary by platform and settings)
A widely used balance between surgical control and incision size in many vitreoretinal practices

The main problem it solves, in general terms, is enabling surgical repair or stabilization of retinal conditions that cannot be adequately managed by observation, medication, laser alone, or office-based procedures.

Indications (When ophthalmologists or optometrists use it)

Common clinical scenarios where a surgeon may consider 23-gauge vitrectomy include:

Retinal detachment repair (often alongside other techniques, depending on case features)
Vitreous hemorrhage (bleeding into the vitreous cavity) that obscures vision or prevents retinal evaluation
Epiretinal membrane (macular pucker) causing distortion or reduced central vision
Macular hole surgery
Diabetic tractional retinal detachment or traction threatening the macula
Retained lens fragments after cataract surgery (in selected situations)
Intraocular foreign body management (case-dependent)
Endophthalmitis management (in selected cases; approach varies by severity and clinician)
Diagnostic vitrectomy for unclear intraocular inflammation or suspected malignancy (performed selectively)

Optometrists do not perform vitrectomy, but they may identify symptoms and exam findings that prompt referral to a retina specialist for evaluation.

Contraindications / when it’s NOT ideal

Whether 23-gauge vitrectomy is suitable depends on the patient’s eye anatomy, the disease being treated, the surgeon’s plan, and equipment availability. Situations where it may be less suitable—or where a different approach may be preferred—can include:

Poor visualization of the retina during surgery (for example, dense corneal scarring or severe media opacity), where additional steps or alternative strategies may be needed
Eyes with unusual scleral thickness or anatomy where specific entry techniques, gauge choice, or suturing strategy may be modified
Cases where a surgeon prefers a different gauge (such as 25- or 27-gauge for smaller instrumentation, or 20-gauge for specific complex needs), depending on tools required and case complexity
Patients who cannot safely undergo eye surgery or anesthesia due to significant systemic health limitations (decision individualized)
Situations requiring specialized instruments that may not be available in a given gauge on a given surgical platform (varies by manufacturer and facility)

These are not absolute “never” categories; they highlight that the gauge and technique are chosen to match the clinical goals and constraints.

How it works (Mechanism / physiology)

A vitrectomy works by mechanically removing vitreous gel and replacing its volume with a clear fluid during surgery. This creates space and visibility so the surgeon can treat the retina and related structures.

Key anatomy involved includes:

Vitreous cavity: the space filled by vitreous gel in front of the retina
Retina: the thin neural tissue lining the back of the eye; responsible for sensing light
Macula: the central retina responsible for sharp, detailed vision
Pars plana: the relatively safe entry zone in the ciliary body region used to access the vitreous cavity
Sclera: the firm “white” outer coat of the eye where small incisions are made

Core physiologic principles:

Removing traction: If the vitreous is pulling on the retina or macula, removing it can reduce mechanical forces contributing to distortion, tearing, or detachment.
Clearing the visual axis: Removing blood, inflammatory debris, or opacities from the vitreous can restore a clear path for light to reach the retina.
Enabling retinal repair: Vitrectomy allows tools to reach the retinal surface for maneuvers such as membrane peeling, laser treatment, or internal tamponade placement.

Onset and duration:

Vitrectomy is a surgical intervention rather than a medication, so “onset” is not like a drug effect. Visual recovery, when it occurs, depends on the underlying disease, the condition of the retina/macula, and healing.
The vitreous gel does not “grow back” in the same way after removal; the eye’s cavity becomes filled with fluid produced by the eye. However, the long-term visual result is driven by retinal health and whether the original problem recurs or progresses.

Reversibility:

Because tissue is removed and internal structures may be treated, vitrectomy is not considered reversible in the way an external device would be. Some intraocular materials used during surgery (such as gas) are temporary, while others (such as silicone oil) may be removed later depending on the clinical plan.

23-gauge vitrectomy Procedure overview (How it’s applied)

The exact workflow varies by surgeon, facility, and diagnosis, but a general sequence often looks like this:

Evaluation/exam
– Symptom review (blurred vision, floaters, distortion, flashes, shadow/curtain) and medical/eye history
– Eye exam with retinal evaluation, often including imaging such as optical coherence tomography (OCT) for macular disorders or ultrasound when the view is limited
– Surgical planning, including whether additional procedures may be combined (varies by case)
Preparation
– Anesthesia planning (local/regional anesthesia with sedation vs general anesthesia depends on patient factors and case complexity)
– Sterile preparation of the eye and surrounding skin
– Placement of a lid speculum to keep the eye open
Intervention (the vitrectomy and retinal work)
– Small entry ports are created through the sclera using 23-gauge trocar-cannula systems
– A balanced salt solution infusion maintains eye pressure and shape while instruments are used
– The vitreous gel is removed with a vitrector cutter, improving access and reducing traction
– Additional steps may be performed as needed, such as treating retinal tears, removing membranes, or addressing a detachment (details depend on diagnosis)
Immediate checks and closure
– The surgeon confirms retinal status and eye pressure stability at the end of the case
– The small entry sites may self-seal or be sutured if needed (varies by wound construction and intraoperative findings)
– A postoperative medication plan is set by the treating team (not detailed here)
Follow-up
– Postoperative visits monitor healing, inflammation, eye pressure, retinal attachment, and visual recovery
– Follow-up timing and duration vary by clinician and case

This overview is intentionally high level; specific steps and tools depend heavily on what problem is being treated.

Types / variations

“23-gauge vitrectomy” describes instrument size, not a single disease-specific operation. Common variations include:

Transconjunctival small-gauge vitrectomy: Ports are placed through the conjunctiva (the thin surface tissue) and sclera with small cannulas. Many modern cases use this approach.
Diagnostic vs therapeutic vitrectomy:
Diagnostic vitrectomy collects vitreous samples to help evaluate certain inflammatory, infectious, or malignant processes (used selectively).
Therapeutic vitrectomy treats a known structural problem (e.g., retinal detachment, macular hole, non-clearing hemorrhage).
Core vitrectomy vs more extensive vitrectomy: The amount of vitreous removed depends on the clinical goal and safety considerations.
Combined procedures:
Phacovitrectomy (cataract surgery combined with vitrectomy) may be done in some patients, depending on lens status and surgeon preference.
Vitrectomy may be paired with a scleral buckle, laser treatment, or other retinal repair steps (case-dependent).
Tamponade choices: At the end of surgery, the vitreous cavity may be left with fluid or filled with a tamponade agent to support retinal healing. Options can include:
Gas bubble (temporary; specific gas type and duration vary)
Silicone oil (may be longer-term and sometimes removed in a later procedure)
Choice varies by diagnosis, retinal findings, and clinician preference.
Gauge selection within small-gauge surgery: Some surgeons choose 25- or 27-gauge for smaller incisions, or 20-gauge for selected complex cases; 23-gauge remains a common option with broad instrument availability.

Pros and cons

Pros:

Smaller incisions than traditional 20-gauge vitrectomy in many setups
Often supports efficient access to the retina for both macular and peripheral retinal disease
Can clear vitreous opacities (such as blood) that block retinal visualization
Can reduce vitreoretinal traction contributing to retinal tears, detachment, or macular distortion
Allows multiple retinal treatments in one operative session (case-dependent)
Wide availability of instruments and surgeon familiarity in many regions (varies by facility)

Cons:

It is intraocular surgery and therefore carries meaningful risks (severity and likelihood vary by case)
Possible postoperative inflammation and temporary blurred vision are common after many eye surgeries
Risk of infection (endophthalmitis) exists with any intraocular procedure, though it is uncommon overall (no universal rate applies to all settings)
Eye pressure changes can occur after surgery and may require monitoring and management
Cataract progression can occur after vitrectomy in some phakic (natural-lens) eyes, especially in older adults (timing varies)
Retinal complications such as tears, recurrent detachment, or macular changes can occur depending on the underlying condition and surgical complexity

Aftercare & longevity

Aftercare and the durability of results depend more on the underlying retinal condition than on the gauge alone. In general, outcomes are influenced by:

Diagnosis and severity at the time of surgery: For example, macular disorders versus complex detachments have different recovery patterns.
Macular health: The macula’s preoperative status (such as duration of traction or detachment) can affect visual recovery potential.
Tamponade choice and postoperative positioning: If a gas bubble or oil is used, postoperative instructions may include positioning and activity limits; specifics vary by clinician and case.
Follow-up consistency: Monitoring is used to detect issues such as pressure elevation, inflammation, recurrent bleeding, or recurrent retinal detachment.
Coexisting eye conditions: Cataract, glaucoma, diabetic eye disease, and uveitis can affect recovery and long-term vision.
Systemic conditions: Diabetes and hypertension, among others, may influence retinal disease activity and healing.
Surgical variables: Wound construction, instrument selection, and adjunctive steps (laser, membrane peel, tamponade) are individualized.

“Longevity” is not a single number for vitrectomy. Some patients have long-lasting stabilization after one procedure, while others may need additional treatments because the underlying disease can continue to progress or recur. This varies by clinician and case.

Alternatives / comparisons

Which alternative is appropriate depends on diagnosis, severity, and goals (vision improvement vs stabilization vs diagnostic clarity). Common comparisons include:

Observation/monitoring vs surgery:
Some vitreous floaters, mild epiretinal membranes, or small hemorrhages may be monitored when vision and retinal safety are not threatened.
Surgery is generally considered when there is significant visual impact, progression, or a structural risk to the retina (decision individualized).
Medication or injections vs vitrectomy:
Intravitreal injections (such as anti-VEGF drugs or steroids) are commonly used for retinal vascular leakage and macular swelling in diseases like diabetic macular edema or retinal vein occlusion.
Vitrectomy is used when mechanical traction, non-clearing hemorrhage, or retinal detachment mechanisms require surgical correction rather than pharmacologic control alone.
Laser treatment vs vitrectomy:
Laser photocoagulation can seal certain retinal tears or treat areas of ischemic retina.
Vitrectomy may be needed when the retina is detached, when traction is present, or when the view is blocked and laser cannot be safely or effectively applied.
Pneumatic retinopexy or scleral buckle vs vitrectomy (retinal detachment):
Pneumatic retinopexy is an office-based option for selected detachments with specific tear patterns and patient factors.
Scleral buckle is an external approach that supports the retinal wall.
Vitrectomy (including 23-gauge vitrectomy) is an internal approach and may be chosen depending on tear location, vitreous traction, lens status, and surgeon assessment.
23-gauge vs other vitrectomy gauges (20, 25, 27):
23-gauge is one of several small-gauge options; tradeoffs relate to incision size, instrument rigidity, fluidics, and tool availability.
The “best” gauge is case-specific and varies by surgeon preference and equipment.

23-gauge vitrectomy Common questions (FAQ)

Q: Is 23-gauge vitrectomy the same as a pars plana vitrectomy?
A: Often, yes in practical use. Many surgeons use “23-gauge vitrectomy” to mean a pars plana vitrectomy performed with 23-gauge instruments. The underlying procedure is vitrectomy; the gauge describes instrument size.

Q: Does a 23-gauge vitrectomy hurt?
A: During surgery, anesthesia is used to reduce pain and keep the eye comfortable. After surgery, irritation, scratchiness, or aching can occur and is typically discussed as part of routine postoperative expectations. The experience varies by individual and by the extent of surgery.

Q: How long does it take to recover vision after 23-gauge vitrectomy?
A: Visual recovery depends on the underlying condition (for example, macular hole vs hemorrhage vs detachment) and whether a gas bubble or silicone oil is used. Some people notice gradual improvement over weeks, while others take longer. In some diseases, the main goal is stabilization rather than full visual restoration.

Q: How long do the results last?
A: The vitreous gel removal itself is permanent, but long-term results depend on whether the treated retinal problem resolves and whether related disease progresses. Some conditions are effectively addressed with one surgery, while others may recur or require additional treatments. Longevity varies by clinician and case.

Q: Is 23-gauge vitrectomy safe?
A: It is a commonly performed retinal surgery, but it is still intraocular surgery and carries risks such as infection, bleeding, retinal tears or detachment, inflammation, and eye pressure changes. The overall risk profile depends on the diagnosis, eye health, and surgical complexity. Safety discussions are individualized in clinical practice.

Q: Will I need cataract surgery after vitrectomy?
A: Cataract progression can occur after vitrectomy in some patients who still have their natural lens, especially with increasing age. Whether it happens—and how soon—varies widely. Some patients may already have had cataract surgery or may have combined surgery, depending on the plan.

Q: Can I drive or return to screen work soon after surgery?
A: Timing depends on visual clarity, whether a gas bubble is present, and how the eye is healing. Screen use is often limited more by comfort and blur than by the screen itself, but individual restrictions vary. Functional readiness (including driving) is typically assessed during follow-up.

Q: Why would a surgeon choose 23-gauge instead of 25- or 27-gauge?
A: Gauge choice reflects a balance of incision size, instrument rigidity, fluidics, and the tools needed for the case. Some surgeons prefer 23-gauge for certain complex maneuvers or instrument availability, while others favor smaller gauges for selected situations. Preferences and platforms vary by clinician and facility.

Q: What is a gas bubble, and why is it used?
A: A gas bubble is a temporary internal tamponade that can help support the retina during healing, especially after certain detachment or macular surgeries. The bubble gradually reabsorbs over time, with duration depending on the gas type and concentration (varies by material and manufacturer). Activity restrictions can apply when gas is present, and these are individualized.

Q: What complications are watched for after surgery?
A: Follow-up commonly monitors for infection, inflammation, eye pressure changes, recurrent bleeding, and retinal status (such as new tears or recurrent detachment). The specific concerns depend on the original diagnosis and what additional steps were performed during surgery. Not every patient experiences complications, but monitoring is part of standard postoperative care.