Do phlyctenules more commonly appear near the center of the cornea or at the limbus?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Do phlyctenules more commonly appear near the center of the cornea or at the limbus?

Explanation:
Phlyctenules are an immune-mediated reaction that occurs at the corneal-scleral junction. They form as small, raised white-yellow nodules at the limbus because this peripheral area has rich conjunctival blood vessels that bring immune cells and inflammatory mediators close to the cornea. The center of the cornea is avascular, so it doesn’t support this kind of peripheral nodular reaction. Therefore, these lesions characteristically appear at the limbus rather than in the central cornea. They’re often linked to hypersensitivity to antigens such as TB protein or staphylococcal proteins and accompany ocular surface inflammation.

Phlyctenules are an immune-mediated reaction that occurs at the corneal-scleral junction. They form as small, raised white-yellow nodules at the limbus because this peripheral area has rich conjunctival blood vessels that bring immune cells and inflammatory mediators close to the cornea. The center of the cornea is avascular, so it doesn’t support this kind of peripheral nodular reaction. Therefore, these lesions characteristically appear at the limbus rather than in the central cornea. They’re often linked to hypersensitivity to antigens such as TB protein or staphylococcal proteins and accompany ocular surface inflammation.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy