In a penetrating keratoplasty, the clouded tissue is replaced by:

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

In a penetrating keratoplasty, the clouded tissue is replaced by:

Explanation:
Penetrating keratoplasty is a full-thickness corneal transplant where the cloudy cornea is removed and replaced with a donor cornea from a deceased person. The donor tissue provides a healthy corneal structure—stroma, endothelium, and epithelium—that can restore transparency and vision. Using one’s own tissue (autograft) isn’t applicable here because there isn’t a healthy, suitable cornea to transplant from the same person. Leaving host tissue or using an artificial cornea are alternatives only in different contexts; standard PKP relies on donor tissue for the replacement.

Penetrating keratoplasty is a full-thickness corneal transplant where the cloudy cornea is removed and replaced with a donor cornea from a deceased person. The donor tissue provides a healthy corneal structure—stroma, endothelium, and epithelium—that can restore transparency and vision. Using one’s own tissue (autograft) isn’t applicable here because there isn’t a healthy, suitable cornea to transplant from the same person. Leaving host tissue or using an artificial cornea are alternatives only in different contexts; standard PKP relies on donor tissue for the replacement.

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