Cohesive vs Dispersive Viscoelastics: What's the Difference?

Ophthalmic viscosurgical devices (OVD) are essential in cataract surgery. Based on their physical properties they fall into two main groups with different strengths.

Cohesive OVD

Viscoelastics whose molecules bind well together, such as high-concentration sodium hyaluronate:

• Maintain the anterior chamber effectively
• Create working space for the surgeon
• Easy to remove after surgery, reducing the risk of post-operative pressure spikes

Dispersive OVD

Viscoelastics that spread and coat tissue surfaces well:

• Protect the corneal endothelium especially well
• Adhere to the cornea and are not easily washed away during phaco
• Slightly harder to remove

The Soft-Shell Technique

Many surgeons combine both types (dispersive to coat the cornea, cohesive to maintain the anterior chamber) to gain the benefits of each.

Conclusion

The choice depends on the technique and the surgeon’s judgment. What matters is high clarity, sterility, and certification — for safe, smooth surgery.

Browse certified viscoelastics for eye surgery, or contact our team for advice through any channel.