Our UHN programs and services are among the most advanced in the world. We have grouped our physicians, staff, services and resources into 10 medical programs to meet the needs of our patients and help us make the most of our resources.
University Health Network is a health care and medical research organization in Toronto, Ontario, Canada. The scope of research and complexity of cases at UHN has made us a national and international source for discovery, education and patient care.
Our 10 medical programs are spread across eight hospital sites – Princess Margaret, Toronto General, Toronto Rehab’s five sites, Toronto Western – as well as our education programs through the Michener Institute of Education at UHN. Learn more about the services, programs and amenities offered at each location.
Maps & Directions
Find out how to get to and around our nine locations — floor plans, parking, public transit, accessibility services, and shuttle information.
Ways You Can Help
Being touched by illness affects us in different ways. Many people want to give back to the community and help others. At UHN, we welcome your contribution and offer different ways you can help so you can find one that suits you.
The Newsroom is the source for media looking for information about UHN or trying to connect with one of our experts for an interview. It’s also the place to find UHN media policies and catch up on our news stories, videos, media releases, podcasts and more.
If you've been scheduled for a corneal transplant, you probably have some questions. Our guide offers the answers you're looking for and helps you prepare for your operation.
The cornea is a series of clear layers on the outside of the eye that help it focus light. A scarred or damaged cornea can impair vision. In a corneal transplant, the surgeon replaces your scarred or damaged cornea with a clear, healthy one from a human donor.
There are several types of corneal transplants. Your surgeon will choose the type of transplant based on your specific need.
Full Thickness Corneal Transplant
When both the inner and outer layers of the cornea are damaged, your surgeon may need to replace the full thickness of the cornea. This is known as penetrating keratoplasty (PKP). The damaged cornea will be removed, and a donor cornea will be stitched in place.
Full recovery from a PKP transplant can take more than 1 year, and there is a greater risk of the donor cornea being rejected by the body’s immune system than for other types of transplant.
Partial Thickness Corneal Transplant
If only the outer and middle layers are damaged, your surgeon may replace only these layers through a procedure known as deep anterior lamellar keratoplasty (DALK).
The recovery time for DALK is typically less than that of PKP, and the risk for transplant rejection is lower.
The innermost layer of the cornea is known as the ‘endothelium’. If only this layer is damaged, your surgeon may replace it through one of two procedures:
In both of these, the inner layer is removed through a small incision, the donor tissue is inserted and the incision is closed with a few stitches. The procedures differ in the thickness of the donor tissue. The donor tissue for the DMEK surgery is thinner than for the DSEK surgery, resulting in a typically faster recovery.
Both procedures also involve the insertion of an air bubble to hold the donor tissue against the remaining cornea so that it heals correctly.
Learn how smoking and tobacco can affect your recovery after surgery, and how quitting can improve your health.