Viscoelastics
19/01/11 21:22
Viscoelastics
- Three different types:
- 1. Dispersive (Viscoat, Ocucoat, Vitrax)
- 2. Cohesive (Healon, Healon GV)
- 3. Adaptive (Healon 5)
- Dispersive (Viscoat, Ocucoat, & Vitrax)
- looser
- disperse easily
- coat tissue well & protect the endothelium
- retained better in anterior chamber during high level of fluid turbulence
- capable of partitioning spaces
- particularly useful in managing complications.
- lack internal cohesion (vacuumed out in smaller pieces)
- takes longer to completely remove
- Cohesive (Healon, Healon GV)
- greater MW
- more dense
- tend to stick together inside the eye
- maintain A/C, help with capsulorrhexis
- create & maintain space
- either a larger amount of OVD is left, or almost none
- Adaptive (Healon 5)
- very large molecule
- changes characteristics depending on how it’s used
- best to prevent endothelial cell loss (JCATARACT REFRACT SURG-VOL 27, FEB 2001)