Session 3: Oral Exam Potential Question
2) Name three differences between cohesive viscoelastics and dispersive viscoelastics.
Possible Answers
| Cohesive | Dispersive |
|---|---|
Long chains of sodium hyaluronate molecules |
Short chains of chondroitin sulfate and sodium hyaluronate |
High molecular weight |
Low molecular weight |
High viscosity |
Low viscosity |
Easy to remove as a bolus at the end of surgery |
Difficult to aspirate from the anterior chamber |
Minimal coatability |
Excellent for coating and protecting the corneal endothelium during phacoemulsification |
High surface tension; Maintain space well |
Low surface tension; Separate and disperse well in the anterior chamber |
last updated: 9/11/2013
