Biophysical properties of the viscoelastic agents
| Ocucoat | Viscoat | |
| Content | Hydroxypropyl methylcellulose 2% | Sodium chondroitin sulphate 4%–sodium hyaluronate 3% |
| Molecular weight (daltons) | 90 000 | 600 000 |
| Viscosity at zero shear rate (cps) | 4000 | 40 000 |