University of Iowa Health Care

Ophthalmology and Visual Sciences

Session 3: Oral Exam Potential Question

2) Name three differences between cohesive viscoelastics and dispersive viscoelastics.

Possible Answers



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
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