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Adjunctive Vitreoretinal Surgical Techniques
Overview: Seeing the Unseeable, Supporting the Unstable
Two distinct problems drive the techniques covered on this page. The first is visibility. The vitreous and the internal limiting membrane (ILM), the retina's innermost basement membrane and the surgical target in macular hole and epiretinal membrane surgery, are nearly transparent and hard to distinguish from surrounding tissue without help. The second problem is mechanical: some retinal detachments, especially those complicated by proliferative vitreoretinopathy (PVR) or extensive inferior pathology, need more peripheral support than internal tamponade alone can provide. Staining dyes address the first problem. Combining vitrectomy with a scleral buckle addresses the second.
Staining the Internal Limiting Membrane
The ILM is selectively stained with either indocyanine green (ICG) or brilliant blue G (BBG) during membrane-peeling surgery. Both dyes improve visualization and let the surgeon peel more completely and safely than is possible from the faint reflex of unstained tissue alone.
BBG has become the preferred agent in many hands, mainly on safety grounds. Several studies link ICG to dose-dependent toxicity in the retinal pigment epithelium, while BBG stains the ILM just as effectively with a more favorable safety profile. The preference is about RPE toxicity, not staining quality.
Intraoperative Vitreous Staining with Triamcinolone
ICG and BBG stain the ILM. Triamcinolone acetonide stains something different: residual vitreous. Its particles adhere to leftover vitreous strands, turning them into visible white particulate against the red fundus reflex. That makes it useful for confirming complete clearance at the vitreous base, where residual strands are otherwise nearly impossible to see unstained.
Combined Vitrectomy and Scleral Buckle
For complex retinal detachments, particularly those with significant inferior pathology or established PVR, adding a scleral buckle to pars plana vitrectomy improves the odds of single-operation anatomic success. The buckle gives external support against residual peripheral and equatorial vitreous traction that internal tamponade alone cannot fully address. PVR especially tends to generate ongoing traction at the vitreous base and periphery, and a gas or oil bubble acts mainly where it directly contacts the retinal surface, so it does not reliably counter that traction. Combining the two techniques is a recognized way to hedge against the leading cause of surgical failure in rhegmatogenous retinal detachment repair, rather than relying on internal tamponade alone.
- ICG and BBG both stain the ILM well; BBG is preferred by many surgeons specifically for its lower RPE toxicity risk relative to ICG.
- Triamcinolone stains residual vitreous, not the ILM. Its role is confirming complete vitreous base clearance, not membrane peeling.
- Combining vitrectomy with a scleral buckle is reserved for complex cases (inferior pathology, PVR) where internal tamponade alone is unlikely to be enough.
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