R R

What Is a Keratoplasty Donor Button?

A keratoplasty donor button is a circular piece of donor corneal tissue prepared for transplantation. In penetrating keratoplasty, it is a full-thickness corneal button that replaces the patient's diseased cornea. In lamellar procedures, the donor tissue may include only specific layers, but the graft is still often described as a button once it is cut to the planned diameter. The donor button is sized to match the recipient opening or bed so it can be positioned securely and heal with stable alignment.

Link to This Resource Page

Provide a valuable resource to your clients or customers by linking to this resource page. Just place the following link on your website.

To display this...

What Is a Keratoplasty Donor Button?

A keratoplasty donor button is a circular piece of donor corneal tissue prepared for transplantation. In penetrating keratoplasty, it is a full-thickness corneal button that replaces the patient's diseased cornea. In lamellar procedures, the donor tissue may include only specific layers, but the graft is still often described as a button once it is cut to the planned diameter. The donor button is sized to match the recipient opening or bed so it can be positioned securely and heal with stable alignment.

read more about keratoplasty donor button ...

Copy this HTML:

Copy HTML Copied!

How the Donor Button Is Prepared

The donor cornea is typically cut with a trephine or donor punch to a specific diameter. Surgeons may select a donor button that is slightly larger than the host opening in some full-thickness cases to improve wound fit and reduce complication risk. The tissue is handled carefully to protect the endothelium, which is critical for corneal clarity. Preparation steps depend on whether the graft is intended for full-thickness or partial-thickness transplantation.

How It Is Used in Different Transplant Types

Donor tissue is tailored to the diseased layer.

  • Penetrating keratoplasty uses a full-thickness donor button.
  • Deep anterior lamellar keratoplasty uses donor stroma while preserving the recipient endothelium.
  • Endothelial keratoplasty uses thin posterior graft tissue rather than a full-thickness button.

Your surgeon selects the transplant type based on which corneal layer is failing.

Tissue Screening and Safety

Donor tissue is recovered and processed through eye bank systems that screen for transmissible disease and evaluate tissue quality. The cornea is also assessed for clarity and endothelial health before use. Although transmission risk is very low, it is not zero, which is why strict screening and sterile handling protocols are followed. Your surgeon can explain the tissue source and safety standards used in your region.

Storage and Handling

Donor corneas are stored in approved preservation media at an eye bank until surgery. During surgery, the donor button is kept hydrated and protected from mechanical trauma. Orientation and gentle handling are important to avoid endothelial damage and to support good postoperative clarity. After surgery, follow-up and prescribed drops help protect the graft and monitor for rejection.

FAQs on Keratoplasty Donor Buttons

Where does the donor tissue come from?

Donor corneal tissue typically comes from deceased donors through regulated eye bank systems. Tissue is screened and evaluated before it is released for transplantation.

How is the donor button size chosen?

Size selection depends on the procedure and the eye's anatomy. In full-thickness transplants, surgeons may choose a donor button that matches or is slightly larger than the host opening, while lamellar procedures are sized based on the layer being replaced and the planned optical zone.

Can the donor button be rejected?

Yes. Rejection can occur because donor tissue can trigger an immune response, especially when donor endothelium is transplanted. Ongoing monitoring and anti-inflammatory drops help reduce risk, and prompt treatment can sometimes reverse early rejection.

How long does donor corneal tissue stay viable before surgery?

Viability depends on the preservation method and local eye bank protocols. Your surgeon and eye bank follow established storage time limits to ensure tissue quality at the time of transplantation.

References

Penetrating Keratoplasty. EyeWiki (American Academy of Ophthalmology). https://eyewiki.org/Penetrating_Keratoplasty. Date Accessed February 4 2026.

Penetrating Keratoplasty. StatPearls (NCBI Bookshelf, National Library of Medicine). https://www.ncbi.nlm.nih.gov/books/NBK592388/. Date Accessed February 4 2026.

Cornea Transplantation. StatPearls (NCBI Bookshelf, National Library of Medicine). https://www.ncbi.nlm.nih.gov/books/NBK539690/. Date Accessed February 4 2026.

EBAA Medical Standards – October 2024. Eye Bank Association of America. https://restoresight.org/wp-content/uploads/2024/11/Medical-Standards-October-2024_COMPLETE_Updated.pdf. Date Accessed February 4 2026.

Therapeutic Keratoplasty. StatPearls (NCBI Bookshelf, National Library of Medicine). https://www.ncbi.nlm.nih.gov/books/NBK592415/. Date Accessed February 4 2026.