Penetrating keratoplasty is defined as which procedure?

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Multiple Choice

Penetrating keratoplasty is defined as which procedure?

Penetrating keratoplasty is a full-thickness corneal transplant. In this procedure, a donor corneal button is prepared and a matching full-thickness button is removed from the patient’s cornea; the donor button is then sutured into place, replacing all corneal layers from surface to stroma. This is why it’s the correct description: it involves the entire thickness of the cornea being replaced. The other options describe different procedures: replacing the iris with donor tissue isn’t a corneal transplant but an iris prosthesis; removing and replacing the sclera is a scleral graft; and laser treatment for corneal scars refers to surface reshaping therapies, not tissue transplantation.

Penetrating keratoplasty is a full-thickness corneal transplant. In this procedure, a donor corneal button is prepared and a matching full-thickness button is removed from the patient’s cornea; the donor button is then sutured into place, replacing all corneal layers from surface to stroma. This is why it’s the correct description: it involves the entire thickness of the cornea being replaced.

The other options describe different procedures: replacing the iris with donor tissue isn’t a corneal transplant but an iris prosthesis; removing and replacing the sclera is a scleral graft; and laser treatment for corneal scars refers to surface reshaping therapies, not tissue transplantation.

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