Lesson Summary

Amniotic membrane, or amnion tissue, is derived from the human placenta, specifically harvested from consenting donors following a cesarean section. It functions as a biologic bandage with several therapeutic roles in eye care.

The key therapeutic roles of amnion tissue include:

• Providing a scaffold for epithelial cell migration, aiding tissue repair.
• Delivering growth factors responsible for nutrition, corneal healing, and reducing inflammation.
• Creating a healing-promoting environment that actively participates in the wound healing process, unlike synthetic materials such as bandage contact lenses.

Types of amniotic membranes used in eye care are:

• Cryopreserved
• Dehydrated - most favored by optometrists due to excellent clinical outcomes and superior return on investment (ROI).
• Lyophilized

Amnion tissue is composed of several biochemical and structural elements that work synergistically to promote ocular surface healing:

• Extracellular matrix: Contains collagen which provides structural support.
• Growth factors: Includes transcription growth factors that stimulate epithelial proliferation and improve wound closure.
• Anti-inflammatory properties: Achieved by down-regulating interleukins to reduce inflammation.
• Anti-scarring effects: Impacting myofibroblast differentiation to minimize scarring during the healing process.

Overall, amniotic membranes not only cover wounds but actively enhance healing through their unique biological components and therapeutic mechanisms.