viscoelastic
Pronunciation: vis-ko-ee-LAS-tik
Injectable gel substance used to maintain eye structure and protect tissues during surgery.
Full Definition
Viscoelastic substances are sterile, injectable gel-like materials used extensively in ophthalmic surgery to maintain anterior chamber depth, protect corneal endothelium, and facilitate surgical manipulation. Common types include hyaluronic acid-based agents (such as Healon) and chondroitin sulfate combinations, each with specific rheological properties affecting their surgical applications. Viscoelastics are classified as cohesive or dispersive based on their molecular behavior, influencing their protective capabilities and removal characteristics. Proper selection and complete removal of viscoelastic material is important to prevent postoperative pressure spikes.
Usage
Usage note: Often abbreviated as OVD (ophthalmic viscosurgical device) in surgical notes.
In Context
- "Dispersive viscoelastic was injected to protect the corneal endothelium during phacoemulsification." — Operative technique note
- "Complete viscoelastic removal was confirmed with irrigation and aspiration." — Surgical conclusion